Sending Email in Android using JavaMail API without using the default built-in app

Question

I am trying to create a mail sending application in Android    If I use    Intent emailIntent   new Intent android content Intent ACTION SEND     This will launch the built-in Android application  I m trying to send the mail on button click directly without using this application

User · Answer

Here are a lot solutions  However I think we must change the configuration of the GMail to allow accessing from less secure devices  Go to the link below and enable it  It works for me  https   myaccount google com lesssecureapps pli 1

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Thank you for your valuable information  Code is working fine  I am able to add attachment also by adding following code   private Multipart  multipart    multipart   new MimeMultipart      public void addAttachment String filename String subject  throws Exception        BodyPart messageBodyPart   new MimeBodyPart         DataSource source   new FileDataSource filename        messageBodyPart setDataHandler new DataHandler source         messageBodyPart setFileName filename         multipart addBodyPart messageBodyPart        BodyPart messageBodyPart2   new MimeBodyPart         messageBodyPart2 setText subject          multipart addBodyPart messageBodyPart2          message setContent  multipart

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I am unable to run Vinayak B s code  Finally i solved this issue by following    1 Using this  2 Applying AsyncTask   3 Changing security issue of sender gmail account  Change to  TURN ON   in this

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Did you consider using Apache Commons Net   Since 3 3  just one jar  and you can depend on it using gradle or maven  and you re done   http   blog dahanne net 2013 06 17 sending-a-mail-in-java-and-android-with-apache-commons-net

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100  working code with demo You can also send multiple emails using this answer  Download Project HERE Step 1   Download mail  activation  additional jar files and add in your project libs folder in android studio  I added a screenshot see below Download link  Login with gmail  using your from mail  and TURN ON  toggle button LINK Most of the people forget about this step i hope you will not  Step 2    After completing this process   Copy and past this classes into your project  GMail java import android util Log   import java io UnsupportedEncodingException  import java util List  import java util Properties   import javax mail Message  import javax mail MessagingException  import javax mail Session  import javax mail Transport  import javax mail internet AddressException  import javax mail internet InternetAddress  import javax mail internet MimeMessage   public class GMail        final String emailPort    quot 587 quot     gmail s smtp port     final String smtpAuth    quot true quot       final String starttls    quot true quot       final String emailHost    quot smtp gmail com quot         String fromEmail      String fromPassword      List lt String gt  toEmailList      String emailSubject      String emailBody       Properties emailProperties      Session mailSession      MimeMessage emailMessage       public GMail                 public GMail String fromEmail  String fromPassword              List lt String gt  toEmailList  String emailSubject  String emailBody            this fromEmail   fromEmail          this fromPassword   fromPassword          this toEmailList   toEmailList          this emailSubject   emailSubject          this emailBody   emailBody           emailProperties   System getProperties            emailProperties put  quot mail smtp port quot   emailPort           emailProperties put  quot mail smtp auth quot   smtpAuth           emailProperties put  quot mail smtp starttls enable quot   starttls           Log i  quot GMail quot    quot Mail server properties set  quot               public MimeMessage createEmailMessage   throws AddressException              MessagingException  UnsupportedEncodingException            mailSession   Session getDefaultInstance emailProperties  null           emailMessage   new MimeMessage mailSession            emailMessage setFrom new InternetAddress fromEmail  fromEmail            for  String toEmail   toEmailList                Log i  quot GMail quot    quot toEmail   quot    toEmail               emailMessage addRecipient Message RecipientType TO                      new InternetAddress toEmail                       emailMessage setSubject emailSubject           emailMessage setContent emailBody   quot text html quot      for a html email            emailMessage setText emailBody     for a text email         Log i  quot GMail quot    quot Email Message created  quot            return emailMessage             public void sendEmail   throws AddressException  MessagingException            Transport transport   mailSession getTransport  quot smtp quot            transport connect emailHost  fromEmail  fromPassword           Log i  quot GMail quot    quot allrecipients   quot    emailMessage getAllRecipients             transport sendMessage emailMessage  emailMessage getAllRecipients             transport close            Log i  quot GMail quot    quot Email sent successfully  quot              SendMailTask java import android app Activity  import android app ProgressDialog  import android os AsyncTask  import android util Log   import java util List   public class SendMailTask extends AsyncTask        private ProgressDialog statusDialog      private Activity sendMailActivity       public SendMailTask Activity activity            sendMailActivity   activity              protected void onPreExecute             statusDialog   new ProgressDialog sendMailActivity           statusDialog setMessage  quot Getting ready    quot            statusDialog setIndeterminate false           statusDialog setCancelable false           statusDialog show                Override     protected Object doInBackground Object    args            try               Log i  quot SendMailTask quot    quot About to instantiate GMail    quot                publishProgress  quot Processing input     quot                GMail androidEmail   new GMail args 0  toString                        args 1  toString     List  args 2   args 3  toString                        args 4  toString                 publishProgress  quot Preparing mail message     quot                androidEmail createEmailMessage                publishProgress  quot Sending email     quot                androidEmail sendEmail                publishProgress  quot Email Sent  quot                Log i  quot SendMailTask quot    quot Mail Sent  quot              catch  Exception e                publishProgress e getMessage                 Log e  quot SendMailTask quot   e getMessage    e                     return null              Override     public void onProgressUpdate Object    values            statusDialog setMessage values 0  toString                  Override     public void onPostExecute Object result            statusDialog dismiss              Step 3   Now you can change this  class according to your needs also you can send multiple mail using this class  i provide xml and java file both  activity main xml  lt  xml version  quot 1 0 quot  encoding  quot utf-8 quot   gt   lt LinearLayout xmlns android  quot http   schemas android com apk res android quot      xmlns tools  quot http   schemas android com tools quot      android layout width  quot match parent quot      android layout height  quot match parent quot      android orientation  quot vertical quot      android paddingLeft  quot 20dp quot      android paddingRight  quot 20dp quot      android paddingTop  quot 30dp quot  gt        lt TextView         android id  quot   id textView1 quot          android layout width  quot wrap content quot          android layout height  quot wrap content quot          android paddingTop  quot 10dp quot          android text  quot From Email quot    gt        lt EditText         android id  quot   id editText1 quot          android layout width  quot match parent quot          android layout height  quot wrap content quot          android background  quot  FFFFFF quot          android cursorVisible  quot true quot          android editable  quot true quot          android ems  quot 10 quot          android enabled  quot true quot          android inputType  quot textEmailAddress quot          android padding  quot 5dp quot          android textColor  quot  000000 quot  gt            lt requestFocus   gt       lt  EditText gt        lt TextView         android id  quot   id textView2 quot          android layout width  quot wrap content quot          android layout height  quot wrap content quot          android paddingTop  quot 10dp quot          android text  quot Password  For from email  quot    gt        lt EditText         android id  quot   id editText2 quot          android layout width  quot match parent quot          android layout height  quot wrap content quot          android background  quot  FFFFFF quot          android ems  quot 10 quot          android inputType  quot textPassword quot          android padding  quot 5dp quot          android textColor  quot  000000 quot    gt        lt TextView         android id  quot   id textView3 quot          android layout width  quot wrap content quot          android layout height  quot wrap content quot          android paddingTop  quot 10dp quot          android text  quot To Email quot    gt        lt EditText         android id  quot   id editText3 quot          android layout width  quot match parent quot          android layout height  quot wrap content quot          android background  quot  ffffff quot          android ems  quot 10 quot          android inputType  quot textEmailAddress quot          android padding  quot 5dp quot          android textColor  quot  000000 quot    gt        lt TextView         android id  quot   id textView4 quot          android layout width  quot wrap content quot          android layout height  quot wrap content quot          android paddingTop  quot 10dp quot          android text  quot Subject quot    gt        lt EditText         android id  quot   id editText4 quot          android layout width  quot match parent quot          android layout height  quot wrap content quot          android background  quot  ffffff quot          android ems  quot 10 quot          android padding  quot 5dp quot          android textColor  quot  000000 quot    gt        lt TextView         android id  quot   id textView5 quot          android layout width  quot wrap content quot          android layout height  quot wrap content quot          android paddingTop  quot 10dp quot          android text  quot Body quot    gt        lt EditText         android id  quot   id editText5 quot          android layout width  quot match parent quot          android layout height  quot wrap content quot          android background  quot  ffffff quot          android ems  quot 10 quot          android inputType  quot textMultiLine quot          android padding  quot 35dp quot          android textColor  quot  000000 quot    gt        lt Button         android id  quot   id button1 quot          android layout width  quot wrap content quot          android layout height  quot wrap content quot          android text  quot Send Email quot    gt    lt  LinearLayout gt   SendMailActivity java import android app Activity  import android os Bundle  import android util Log  import android view View  import android widget Button  import android widget TextView   import java util Arrays  import java util List   public class SendMailActivity extends Activity         Override     public void onCreate Bundle savedInstanceState            super onCreate savedInstanceState           setContentView R layout activity main           final Button send    Button  this findViewById R id button1            send setOnClickListener new View OnClickListener                  public void onClick View v                    Log i  quot SendMailActivity quot    quot Send Button Clicked  quot                     String fromEmail     TextView  findViewById R id editText1                            getText   toString                    String fromPassword     TextView  findViewById R id editText2                            getText   toString                    String toEmails     TextView  findViewById R id editText3                            getText   toString                    List lt String gt  toEmailList   Arrays asList toEmails                          split  quot   s    s  quot                     Log i  quot SendMailActivity quot    quot To List   quot    toEmailList                   String emailSubject     TextView  findViewById R id editText4                            getText   toString                    String emailBody     TextView  findViewById R id editText5                            getText   toString                    new SendMailTask SendMailActivity this  execute fromEmail                          fromPassword  toEmailList  emailSubject  emailBody                                      Note Dont forget to add internet permission in your AndroidManifest xml file  lt uses-permission android name  quot android permission INTERNET quot   gt  Hope it work if it not then just comment down below

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I tried using the code that  Vinayak B submitted  However I m getting an error saying  No provider for smtp  I created a new question for this with more information HERE  I was able to fix it myself after all  I had to use an other mail jar and I had to make sure my  access for less secure apps  was turned on   I hope this helps anyone who has the same problem  With this done  this piece of code works on the google glass too

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Sending email programmatically with Kotlin   simple email sending  not all the other features  like attachments   TLS is always on Only 1 gradle email dependency needed also   I also found this list of email POP services really helpful  https   support office com en-gb article pop-and-imap-email-settings-for-outlook-8361e398-8af4-4e97-b147-6c6c4ac95353 How to use      val auth   EmailService UserPassAuthenticator  quot you gmail com quot    quot yourPassword quot       val to   listOf InternetAddress  quot to email com quot        val from   InternetAddress  quot you gmail com quot       val email   EmailService Email auth  to  from   quot Test Subject quot    quot Hello Body World quot       val emailService   EmailService  quot smtp gmail com quot   465           GlobalScope launch      or however you do background threads         emailService send email         The code  import java util   import javax mail   import javax mail internet InternetAddress import javax mail internet MimeBodyPart import javax mail internet MimeMessage import javax mail internet MimeMultipart  class EmailService private val server  String  private val port  Int         data class Email          val auth  Authenticator          val toList  List lt InternetAddress gt           val from  Address          val subject  String          val body  String            class UserPassAuthenticator private val username  String  private val password  String    Authenticator             override fun getPasswordAuthentication    PasswordAuthentication               return PasswordAuthentication username  password                       fun send email  Email            val props   Properties           props  quot mail smtp auth quot      quot true quot          props  quot mail user quot     email from         props  quot mail smtp host quot     server         props  quot mail smtp port quot     port         props  quot mail smtp starttls enable quot      quot true quot          props  quot mail smtp ssl trust quot     server         props  quot mail mime charset quot      quot UTF-8 quot          val msg  Message   MimeMessage Session getDefaultInstance props  email auth           msg setFrom email from          msg sentDate   Calendar getInstance   time         msg setRecipients Message RecipientType TO  email toList toTypedArray            msg setRecipients Message RecipientType CC  email ccList toTypedArray            msg setRecipients Message RecipientType BCC  email bccList toTypedArray            msg replyTo   arrayOf email from           msg addHeader  quot X-Mailer quot   CLIENT NAME          msg addHeader  quot Precedence quot    quot bulk quot           msg subject   email subject          msg setContent MimeMultipart   apply               addBodyPart MimeBodyPart   apply                   setText email body   quot iso-8859-1 quot                     setContent email htmlBody   quot text html  charset UTF-8 quot                                     Transport send msg             companion object           const val CLIENT NAME    quot Android StackOverflow programmatic email quot           Gradle  dependencies       implementation  com sun mail android-mail 1 6 4      implementation  quot org jetbrains kotlinx kotlinx-coroutines-core 1 3 3 quot     AndroidManifest   lt uses-permission android name  quot android permission INTERNET quot    gt

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here is an alt version that also works for me and has attachments  posted already above but complete version unlike the source link  which people posted they cant get it to work since its missing data   import java util Date   import java util Properties   import javax activation CommandMap   import javax activation DataHandler   import javax activation DataSource   import javax activation FileDataSource   import javax activation MailcapCommandMap   import javax mail BodyPart   import javax mail Multipart   import javax mail PasswordAuthentication   import javax mail Session   import javax mail Transport   import javax mail internet InternetAddress   import javax mail internet MimeBodyPart   import javax mail internet MimeMessage   import javax mail internet MimeMultipart     public class Mail extends javax mail Authenticator      private String  user     private String  pass      private String    to     private String  from      private String  port     private String  sport      private String  host      private String  subject     private String  body      private boolean  auth      private boolean  debuggable      private Multipart  multipart       public Mail           host    smtp gmail com      default smtp server       port    465      default smtp port       sport    465      default socketfactory port        user          username       pass          password       from          email sent from       subject          email subject       body          email body        debuggable   false     debug mode on or off - default off       auth   true     smtp authentication - default on        multipart   new MimeMultipart             There is something wrong with MailCap  javamail can not find a handler for the multipart mixed part  so this bit needs to be added       MailcapCommandMap mc    MailcapCommandMap  CommandMap getDefaultCommandMap         mc addMailcap  text html   x-java-content-handler com sun mail handlers text html         mc addMailcap  text xml   x-java-content-handler com sun mail handlers text xml         mc addMailcap  text plain   x-java-content-handler com sun mail handlers text plain         mc addMailcap  multipart     x-java-content-handler com sun mail handlers multipart mixed         mc addMailcap  message rfc822   x-java-content-handler com sun mail handlers message rfc822         CommandMap setDefaultCommandMap mc            public Mail String user  String pass         this           user   user        pass   pass           public boolean send   throws Exception        Properties props    setProperties          if   user equals      amp  amp    pass equals      amp  amp   to length  gt  0  amp  amp    from equals      amp  amp    subject equals      amp  amp    body equals               Session session   Session getInstance props  this           MimeMessage msg   new MimeMessage session           msg setFrom new InternetAddress  from            InternetAddress   addressTo   new InternetAddress  to length          for  int i   0  i  lt   to length  i               addressTo i    new InternetAddress  to i                      msg setRecipients MimeMessage RecipientType TO  addressTo           msg setSubject  subject          msg setSentDate new Date                setup message body        BodyPart messageBodyPart   new MimeBodyPart           messageBodyPart setText  body           multipart addBodyPart messageBodyPart              Put parts in message        msg setContent  multipart              send email        Transport send msg           return true         else          return false                  public void addAttachment String filename  throws Exception        BodyPart messageBodyPart   new MimeBodyPart         DataSource source   new FileDataSource filename        messageBodyPart setDataHandler new DataHandler source         messageBodyPart setFileName filename          multipart addBodyPart messageBodyPart             Override    public PasswordAuthentication getPasswordAuthentication          return new PasswordAuthentication  user   pass            private Properties  setProperties          Properties props   new Properties          props put  mail smtp host    host         if  debuggable           props put  mail debug    true                 if  auth           props put  mail smtp auth    true                 props put  mail smtp port    port        props put  mail smtp socketFactory port    sport        props put  mail smtp socketFactory class    javax net ssl SSLSocketFactory         props put  mail smtp socketFactory fallback    false          return props              the getters and setters    public String getBody          return  body           public void setBody String  body         this  body    body          public void setTo String   toArr             TODO Auto-generated method stub       this  to toArr         public void setFrom String string             TODO Auto-generated method stub       this  from string         public void setSubject String string             TODO Auto-generated method stub       this  subject string              more of the getters and setters            and to call it in an activity      Override  public void onCreate Bundle icicle       super onCreate icicle      setContentView R layout main       Button addImage    Button  findViewById R id send email      addImage setOnClickListener new View OnClickListener          public void onClick View view           Mail m   new Mail  gmailusername gmail com    password            String   toArr     bla bla com    lala lala com           m setTo toArr          m setFrom  wooo wooo com           m setSubject  This is an email sent using my Mail JavaMail wrapper from an Android device            m setBody  Email body             try            m addAttachment   sdcard filelocation              if m send                 Toast makeText MailApp this   Email was sent successfully    Toast LENGTH LONG  show               else              Toast makeText MailApp this   Email was not sent    Toast LENGTH LONG  show                        catch Exception e               Toast makeText MailApp this   There was a problem sending the email    Toast LENGTH LONG  show             Log e  MailApp    Could not send email   e

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For those who want to use JavaMail with Kotlin in 2020  First  Add these dependencies to your build gradle file  official JavaMail Maven Dependencies   implementation  com sun mail android-mail 1 6 5  implementation  com sun mail android-activation 1 6 5    implementation  quot org bouncycastle bcmail-jdk15on 1 65 quot  implementation  quot org jetbrains kotlinx kotlinx-coroutines-core 1 3 7 quot  implementation  quot org jetbrains kotlinx kotlinx-coroutines-android 1 3 7 quot   BouncyCastle is for security reasons  Second  Add these permissions to your AndroidManifest xml  lt uses-permission android name  quot android permission INTERNET quot    gt   lt uses-permission android name  quot android permission ACCESS NETWORK STATE quot    gt   Third  When using SMTP  create a Config file object Config       const val EMAIL FROM    quot You Sender Email email com quot      const val PASS FROM    quot Your Sender Password quot       const val EMAIL TO    quot Your Destination Email email com quot     Fourth  Create your Mailer Object object Mailer    init       Security addProvider BouncyCastleProvider       private fun props    Properties   Properties   also              Smtp server         it  quot mail smtp host quot      quot smtp gmail com quot             Change when necessary         it  quot mail smtp auth quot      quot true quot          it  quot mail smtp port quot      quot 465 quot             Easy and fast way to enable ssl in JavaMail         it  quot mail smtp ssl enable quot     true           Dont ever use  quot getDefaultInstance quot  like other examples do  private fun session emailFrom  String  emailPass  String   Session   Session getInstance props    object   Authenticator         override fun getPasswordAuthentication    PasswordAuthentication           return PasswordAuthentication emailFrom  emailPass            private fun builtMessage firstName  String  surName  String   String       return  quot  quot  quot               lt b gt Name  lt  b gt   firstName   lt br  gt               lt b gt Surname  lt  b gt   surName  lt br  gt           quot  quot  quot  trimIndent      private fun builtSubject issue  String  firstName  String  surName  String  String       return  quot  quot  quot               issue    firstName   surName          quot  quot  quot  trimIndent      private fun sendMessageTo emailFrom  String  session  Session  message  String  subject  String        try           MimeMessage session  let   mime - gt              mime setFrom InternetAddress emailFrom                  Adding receiver             mime addRecipient Message RecipientType TO  InternetAddress Config EMAIL TO                  Adding subject             mime subject   subject                Adding message             mime setText message                 Set Content of Message to Html if needed             mime setContent message   quot text html quot                  send mail             Transport send mime                   catch  e  MessagingException            Log e  quot  quot   quot  quot      Or use timber  it really doesn t matter          fun sendMail firstName  String  surName  String               Open a session         val session   session Config EMAIL FROM  Config PASSWORD FROM              Create a message         val message   builtMessage firstName  surName              Create subject         val subject   builtSubject firstName  surName              Send Email         CoroutineScope Dispatchers IO  launch   sendMessageTo Config EMAIL FROM  session  message  subject       Note  If you want a more secure way to send your email  and you want a more secure way    use http as mentioned in the solutions before  I will maybe add it later in this answer  You have to properly check  if the users phone has internet access  otherwise the app will crash  When using gmail  enable  quot less secure apps quot   this will not work  when you gmail has two factors enabled  https   myaccount google com lesssecureapps pli 1 Some credits belong to  https   medium com  chetan garg36 android-send-mails-not-intent-642d2a71d2ee  he used RxJava for his solution

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Word of warning if using  smtp gmail com  as the default smtp server    Google will force you to change your linked email account password frequently due to their over zealous  suspicious activity  polices  In essence it treats repeated smtp requests from different countries within a short time frame as  suspicious activity   As they assume you  the email account holder  can only be in one country at a time   When google systems detect  suspicious activity  it will prevent further emails until you change the password  As you will have hard coded the password into the app you have to re-release the app each time this happens  not ideal  This happened 3 times in a week to me  I even stored the password on another server and dynamically fetched the password each time google forced me to change it   So I recommend using one of the many free smtp providers instead of  smtp gmail com  to avoid this security problem  Use the same code but change  smtp gmail com  to your new smtp forwarding host

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To add attachment  don t forget to add    MailcapCommandMap mc    MailcapCommandMap  CommandMap              getDefaultCommandMap        mc addMailcap  text html   x-java-content-handler com sun mail handlers text html        mc addMailcap  text xml   x-java-content-handler com sun mail handlers text xml        mc addMailcap  text plain   x-java-content-handler com sun mail handlers text plain        mc addMailcap  multipart     x-java-content-handler com sun mail handlers multipart mixed        mc addMailcap  message rfc822   x-java-content-handler com sun mail handlers message rfc822        CommandMap setDefaultCommandMap mc

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In case that you are demanded to keep the jar library as small as possible  you can include the SMTP POP3 IMAP function separately to avoid the  too many methods in the dex  problem    You can choose the wanted jar libraries from the javanet web page  for example  mailapi jar   imap jar can enable you to access icloud  hotmail mail server in IMAP protocol   with the help of additional jar and activation jar

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Add jar files mail jar activation jar additionnal jar   String sub  Thank you for your online registration      Mail m   new Mail  emailid    password       String   toArr     ekkatrainfo gmail com  sEmailId    m setFrom  ekkatrainfo gmail com           m setTo toArr        m setSubject sub       m setBody msg                           try                                if m send                                      else                                                                catch Exception e                                  Log e  MailApp    Could not send email   e                                    package com example ekktra      import java util Date     import java util Properties      import javax activation CommandMap     import javax activation DataHandler     import javax activation DataSource     import javax activation FileDataSource     import javax activation MailcapCommandMap     import javax mail BodyPart     import javax mail Multipart     import javax mail PasswordAuthentication     import javax mail Session     import javax mail Transport     import javax mail internet InternetAddress     import javax mail internet MimeBodyPart     import javax mail internet MimeMessage     import javax mail internet MimeMultipart      public class Mail extends javax mail Authenticator         private String  user        private String  pass         private String    to         private String  from         private String  port        private String  sport         private String  host         private String  subject        private String  body         private boolean  auth         private boolean  debuggable         private Multipart  multipart        public Mail             host    smtp gmail com      default smtp server         port    465      default smtp port         sport    465      default socketfactory port          user          username         pass          password         from          email sent from         subject          email subject         body          email body          debuggable   false     debug mode on or off - default off         auth   true     smtp authentication - default on          multipart   new MimeMultipart               There is something wrong with MailCap  javamail can not find a handler for the        multipart mixed part  so this bit needs to be added         MailcapCommandMap mc    MailcapCommandMap  CommandMap getDefaultCommandMap        mc addMailcap  text html   x-java-content-handler com sun mail handlers text html        mc addMailcap  text xml   x-java-content-handler com sun mail handlers text xml        mc addMailcap  text plain   x-java-content-  handler com sun mail handlers text plain        mc addMailcap  multipart     x-java-content-handler com sun mail handlers multipart mixed        mc addMailcap  message rfc822   x-java-content- handler com sun mail handlers message rfc822         CommandMap setDefaultCommandMap mc            public Mail String user  String pass       this         user   user       pass   pass        public boolean send   throws Exception       Properties props    setProperties        if   user equals      amp  amp    pass equals      amp  amp   to length  gt  0  amp  amp    from equals      amp  amp      subject equals        amp  amp    body equals               Session session   Session getInstance props  this         MimeMessage msg   new MimeMessage session          msg setFrom new InternetAddress  from          InternetAddress   addressTo   new InternetAddress  to length         for  int i   0  i  lt   to length  i             addressTo i    new InternetAddress  to i                  msg setRecipients MimeMessage RecipientType TO  addressTo         msg setSubject  subject        msg setSentDate new Date            setup message body    BodyPart messageBodyPart   new MimeBodyPart         messageBodyPart setText  body         multipart addBodyPart messageBodyPart             Put parts in message      msg setContent  multipart            send email      Transport send msg         return true        else         return false                  public void addAttachment String filename  throws Exception        BodyPart messageBodyPart   new MimeBodyPart         DataSource source   new FileDataSource filename          messageBodyPart setDataHandler new DataHandler source         messageBodyPart setFileName filename         multipart addBodyPart messageBodyPart            Override    public PasswordAuthentication getPasswordAuthentication           return new PasswordAuthentication  user   pass             private Properties  setProperties         Properties props   new Properties          props put  mail smtp host    host       if  debuggable         props put  mail debug    true             if  auth         props put  mail smtp auth    true                props put  mail smtp port    port        props put  mail smtp socketFactory port    sport        props put  mail smtp socketFactory class    javax net ssl SSLSocketFactory         props put  mail smtp socketFactory fallback    false          return props                the getters and setters    public String getBody         return  body         public void setBody String  body       this  body    body         public void setTo String   toArr            TODO Auto-generated method stub     this  to toArr      public void setFrom String string           TODO Auto-generated method stub     this  from string      public void setSubject String string           TODO Auto-generated method stub     this  subject string

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SMTP  Using SMTP is one way to go  and the others have already pointed out ways how to do it  Just note that while doing this  you completely circumvent the built in mail app  and you will have to provide the address of the SMTP server  the user name and password for that server  either statically in your code  or query it from the user   HTTP  Another way would involve a simple server side script  like php  that takes some URL parameters and uses them to send a mail  This way  you only need to make an HTTP request from the device  easily possible with the built in libraries  and don t need to store the SMTP login data on the device  This is one more indirection compared to direct SMTP usage  but because it s so very easy to make HTTP request and send mails from PHP  it might even be simpler than the direct way   Mail Application  If the mail shall be send from the users default mail account that he already registered with the phone  you d have to take some other approach  If you have enough time and experience  you might want to check the source code of the Android Email application to see if it offers some entry point to send a mail without user interaction  I don t know  but maybe there is one    Maybe you even find a way to query the users account details  so you can use them for SMTP   though I highly doubt that this is possible  because it would be a huge security risk and Android is built rather securely

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Without user intervention  you can send as follows    Send email from client apk  Here mail jar  activation jar is required to send java email  If these jars are added  it might increase the APK Size   Alternatively  You can use a web-service at the server side code  which will use the same mail jar and activation jar to send email  You can call the web-service via asynctask and send email  Refer same link      But  you will need to know the credentials of the mail account

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In order to help those getting a Network On Main Thread Exception with an SDK Target  9  This is using droopie s code above but will work similarly for any   StrictMode ThreadPolicy policy   new StrictMode ThreadPolicy Builder   permitAll   build     StrictMode setThreadPolicy policy     android os NetworkOnMainThreadException   You can use AsyncTask as below  public void onClickMail View view        new SendEmailAsyncTask   execute       class SendEmailAsyncTask extends AsyncTask  lt Void  Void  Boolean gt        Mail m   new Mail  from gmail com    my password         public SendEmailAsyncTask             if  BuildConfig DEBUG  Log v SendEmailAsyncTask class getName     SendEmailAsyncTask              String   toArr      to mail gmail com            m setTo toArr           m setFrom  from mail gmail com            m setSubject  Email from Android            m setBody  body                 Override     protected Boolean doInBackground Void    params            if  BuildConfig DEBUG  Log v SendEmailAsyncTask class getName     doInBackground              try               m send                return true            catch  AuthenticationFailedException e                Log e SendEmailAsyncTask class getName     Bad account details                e printStackTrace                return false            catch  MessagingException e                Log e SendEmailAsyncTask class getName    m getTo null     failed                e printStackTrace                return false            catch  Exception e                e printStackTrace                return false

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Send e-mail in Android using the JavaMail API using Gmail authentication  Steps to create a sample Project  MailSenderActivity java  public class MailSenderActivity extends Activity             Override     public void onCreate Bundle savedInstanceState            super onCreate savedInstanceState           setContentView R layout main                    final Button send    Button  this findViewById R id send           send setOnClickListener new View OnClickListener                              public void onClick View v                    try                          GMailSender sender   new GMailSender  quot username gmail com quot    quot password quot                        sender sendMail  quot This is Subject quot                                   quot This is Body quot                                   quot user gmail com quot                                   quot user yahoo com quot                         catch  Exception e                           Log e  quot SendMail quot   e getMessage    e                                                                                      GMailSender java  public class GMailSender extends javax mail Authenticator          private String mailhost    quot smtp gmail com quot          private String user         private String password         private Session session            static              Security addProvider new com provider JSSEProvider                       public GMailSender String user  String password               this user   user             this password   password                Properties props   new Properties               props setProperty  quot mail transport protocol quot    quot smtp quot               props setProperty  quot mail host quot   mailhost              props put  quot mail smtp auth quot    quot true quot               props put  quot mail smtp port quot    quot 465 quot               props put  quot mail smtp socketFactory port quot    quot 465 quot               props put  quot mail smtp socketFactory class quot                       quot javax net ssl SSLSocketFactory quot               props put  quot mail smtp socketFactory fallback quot    quot false quot               props setProperty  quot mail smtp quitwait quot    quot false quot                  session   Session getDefaultInstance props  this                      protected PasswordAuthentication getPasswordAuthentication                return new PasswordAuthentication user  password                      public synchronized void sendMail String subject  String body  String sender  String recipients  throws Exception              try          MimeMessage message   new MimeMessage session              DataHandler handler   new DataHandler new ByteArrayDataSource body getBytes     quot text plain quot                message setSender new InternetAddress sender               message setSubject subject              message setDataHandler handler              if  recipients indexOf       gt  0                 message setRecipients Message RecipientType TO  InternetAddress parse recipients               else               message setRecipient Message RecipientType TO  new InternetAddress recipients               Transport send message               catch Exception e                                          public class ByteArrayDataSource implements DataSource              private byte   data             private String type                public ByteArrayDataSource byte   data  String type                   super                   this data   data                 this type   type                             public ByteArrayDataSource byte   data                   super                   this data   data                             public void setType String type                   this type   type                             public String getContentType                    if  type    null                     return  quot application octet-stream quot                  else                   return type                             public InputStream getInputStream   throws IOException                  return new ByteArrayInputStream data                              public String getName                    return  quot ByteArrayDataSource quot                              public OutputStream getOutputStream   throws IOException                  throw new IOException  quot Not Supported quot                                  JSSEProvider java         Licensed to the Apache Software Foundation  ASF  under one or more     contributor license agreements   See the NOTICE file distributed with     this work for additional information regarding copyright ownership      The ASF licenses this file to You under the Apache License  Version 2 0      the  quot License quot    you may not use this file except in compliance with     the License   You may obtain a copy of the License at           http   www apache org licenses LICENSE-2 0        Unless required by applicable law or agreed to in writing  software     distributed under the License is distributed on an  quot AS IS quot  BASIS      WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND  either express or implied      See the License for the specific language governing permissions and     limitations under the License               author Alexander Y  Kleymenov     version  Revision        import java security AccessController  import java security Provider   public final class JSSEProvider extends Provider        public JSSEProvider             super  quot HarmonyJSSE quot   1 0   quot Harmony JSSE Provider quot            AccessController doPrivileged new java security PrivilegedAction lt Void gt                  public Void run                     put  quot SSLContext TLS quot                            quot org apache harmony xnet provider jsse SSLContextImpl quot                    put  quot Alg Alias SSLContext TLSv1 quot    quot TLS quot                    put  quot KeyManagerFactory X509 quot                            quot org apache harmony xnet provider jsse KeyManagerFactoryImpl quot                    put  quot TrustManagerFactory X509 quot                            quot org apache harmony xnet provider jsse TrustManagerFactoryImpl quot                    return null                                     ADD 3 jars found in the following link to your Android Project  mail jar activation jar additional jar  Click here - How to add External Jars And don t forget to add this line in your manifest   lt uses-permission android name  quot android permission INTERNET quot    gt   Just click below link to change account access for less secure apps https   www google com settings security lesssecureapps Run the project and check your recipient mail account for the mail  Cheers  P S  And don t forget that you cannot do network operation from any Activity in android  Hence it is recommended to use AsyncTask or IntentService to avoid network on main thread exception  Jar files  https   code google com archive p javamail-android

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Could not connect to SMTP host    smtp gmail com  port  465   Add this line in your manifest    lt uses-permission android name  android permission INTERNET    gt

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You can use JavaMail API to handle your email tasks  JavaMail API is available in JavaEE package and its jar is available for download  Sadly it cannot be used directly in an Android application since it uses AWT components which are completely incompatible  in Android   You can find the Android port for JavaMail at the following location  http   code google com p javamail-android   Add the jars to your application and use the SMTP method

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Edit  JavaMail 1 5 5 claims to support Android  so you shouldn t need anything else    I ve ported the latest JavaMail  1 5 4  to Android  It s available in Maven Central  just add the following to build gradle    compile  eu ocathain com sun mail javax mail 1 5 4    You can then follow the official tutorial   Source code is available here  https   bitbucket org artbristol javamail-forked-android

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Those who are getting ClassDefNotFoundError try to move that Three jar files to lib folder of your Project it worked for me

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I found a shorter alternative for others who need help  The code is   package com example mail   import java util Properties   import javax mail Message  import javax mail MessagingException  import javax mail PasswordAuthentication  import javax mail Session  import javax mail Transport  import javax mail internet InternetAddress  import javax mail internet MimeMessage   public class SendMailTLS        public static void main String   args             final String username    username gmail com           final String password    password            Properties props   new Properties            props put  mail smtp auth    true            props put  mail smtp starttls enable    true            props put  mail smtp host    smtp gmail com            props put  mail smtp port    587             Session session   Session getInstance props            new javax mail Authenticator                 protected PasswordAuthentication getPasswordAuthentication                     return new PasswordAuthentication  username    password                                         try                Message message   new MimeMessage session               message setFrom new InternetAddress  from-email gmail com                 message setRecipients Message RecipientType TO                  InternetAddress parse  to-email gmail com                 message setSubject  Testing Subject                message setText  Dear Mail Crawler                       n n No spam to my email  please                  Transport send message                System out println  Done               catch  MessagingException e                throw new RuntimeException e                       Source  Sending Email via JavaMail API  Hope this Helps  Good Luck

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For sending a mail with attachment    public class SendAttachment                      public static void main String    args                   to address                     String to  abc abc com    change accordingly                       from address                     final String user  efg efg com    change accordingly                     final String password  password    change accordingly                       MailcapCommandMap mc    MailcapCommandMap  CommandMap getDefaultCommandMap                       mc addMailcap  text html   x-java-content-handler com sun mail handlers text html                      mc addMailcap  text xml   x-java-content-handler com sun mail handlers text xml                      mc addMailcap  text plain   x-java-content-handler com sun mail handlers text plain                      mc addMailcap  multipart     x-java-content-handler com sun mail handlers multipart mixed                      mc addMailcap  message rfc822   x-java-content-handler com sun mail handlers message rfc822                      CommandMap setDefaultCommandMap mc                        1  get the session object                      Properties properties   System getProperties                      properties put  mail smtp port    465                       properties put  mail smtp host    smtp gmail com                        properties put  mail smtp socketFactory port    465                        properties put  mail smtp socketFactory class                                javax net ssl SSLSocketFactory                        properties put  mail smtp auth    true                        properties put  mail smtp port    465                       Session session   Session getDefaultInstance properties                     new javax mail Authenticator                        protected PasswordAuthentication getPasswordAuthentication                        return new PasswordAuthentication user password                                                                   2  compose message                      try                       MimeMessage message   new MimeMessage session                       message setFrom new InternetAddress user                        message addRecipient Message RecipientType TO new InternetAddress to                        message setSubject  Hii                           3  create MimeBodyPart object and set your message content                         BodyPart messageBodyPart1   new MimeBodyPart                        messageBodyPart1 setText  How is This                           4  create new MimeBodyPart object and set DataHandler object to this object                         MimeBodyPart messageBodyPart2   new MimeBodyPart                      Location of file to be attached                     String filename   Environment getExternalStorageDirectory   getPath     R2832 zip    change accordingly                     DataSource source   new FileDataSource filename                       messageBodyPart2 setDataHandler new DataHandler source                        messageBodyPart2 setFileName  Hello                           5  create Multipart object and add MimeBodyPart objects to this object                         Multipart multipart   new MimeMultipart                        multipart addBodyPart messageBodyPart1                       multipart addBodyPart messageBodyPart2                          6  set the multiplart object to the message object                     message setContent multipart                           7  send message                      Transport send message                       System out println  MESSAGE SENT                            catch  MessagingException ex   ex printStackTrace

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GmailBackground is small library to send an email in background without user interaction     Usage       BackgroundMail newBuilder this               withUsername  username gmail com                withPassword  password12345                withMailto  toemail gmail com                withType BackgroundMail TYPE PLAIN               withSubject  this is the subject                withBody  this is the body                withOnSuccessCallback new BackgroundMail OnSuccessCallback                      Override                 public void onSuccess                           do some magic                                               withOnFailCallback new BackgroundMail OnFailCallback                      Override                 public void onFail                           do some magic                                               send      Configuration   repositories                  maven   url  https   jitpack io        dependencies               compile  com github yesidlazaro GmailBackground 1 2 0          Permissions    lt uses-permission android name  android permission ACCESS NETWORK STATE   gt   lt uses-permission android name  android permission INTERNET   gt    Also for attachments  you need to set READ EXTERNAL STORAGE permission    lt uses-permission android name  android permission READ EXTERNAL STORAGE   gt    Source   I ve tested it myself

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All the code provided in the other answers is correct and is working fine  but a bit messy  so I decided to publish a library  still in development though  to use it in a easier way  AndroidMail   You have just to create a MailSender  build a mail and send it  already handled in background with an AsyncTask    MailSender mailSender   new MailSender email  password    Mail MailBuilder builder   new Mail MailBuilder    Mail mail   builder      setSender senderMail       addRecipient new Recipient recipient        setText  Hello        build     mailSender sendMail mail     You can receive a notification for the email sent and it has also the support for different Recipients types  TO  CC and BCC   attachments and html   MailSender mailSender   new MailSender email  password    Mail MailBuilder builder   new Mail MailBuilder    Mail mail   builder      setSender senderMail       addRecipient new Recipient recipient        addRecipient new Recipient Recipient TYPE CC  recipientCC        setText  Hello        setHtml   lt h1 style   color red    gt Hello lt  h1 gt         addAttachment new Attachment filePath  fileName        build     mailSender sendMail mail  new MailSender OnMailSentListener           Override     public void onSuccess                mail sent              Override     public void onError Exception error               something bad happened                You can get it via Gradle or Maven   compile  it enricocandino androidmail 1 0 0-SNAPSHOT    Please let me know if you have any issue with it

[java] Sending Email in Android using JavaMail API without using the default/built-in app

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