Javamail Could not convert socket to TLS GMail

Question

I am trying to send an email using JavaMail through gmails SMTP Server  however this code   final String username    mygmail gmail com       final String password    mygmailpassword        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  no-reply gmail com             message setRecipients Message RecipientType TO                  InternetAddress parse  test 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           Returns an this error  Could not convert socket to TLS    The Complete Stacktrace  Exception in thread  main  java lang RuntimeException  javax mail MessagingException  Could not convert socket to TLS    nested exception is      javax net ssl SSLHandshakeException  sun security validator ValidatorException  PKIX path building failed  sun security provider certpath SunCertPathBuilderException  unable to find valid certification path to requested target     at Test main Test java 43  Caused by  javax mail MessagingException  Could not convert socket to TLS    nested exception is      javax net ssl SSLHandshakeException  sun security validator ValidatorException  PKIX path building failed  sun security provider certpath SunCertPathBuilderException  unable to find valid certification path to requested target     at com sun mail smtp SMTPTransport startTLS SMTPTransport java 1907      at com sun mail smtp SMTPTransport protocolConnect SMTPTransport java 666      at javax mail Service connect Service java 317      at javax mail Service connect Service java 176      at javax mail Service connect Service java 125      at javax mail Transport send0 Transport java 194      at javax mail Transport send Transport java 124      at Test main Test java 38  Caused by  javax net ssl SSLHandshakeException  sun security validator ValidatorException  PKIX path building failed  sun security provider certpath SunCertPathBuilderException  unable to find valid certification path to requested target     at com sun net ssl internal ssl Alerts getSSLException Alerts java 174      at com sun net ssl internal ssl SSLSocketImpl fatal SSLSocketImpl java 1649      at com sun net ssl internal ssl Handshaker fatalSE Handshaker java 241      at com sun net ssl internal ssl Handshaker fatalSE Handshaker java 235      at com sun net ssl internal ssl ClientHandshaker serverCertificate ClientHandshaker java 1206      at com sun net ssl internal ssl ClientHandshaker processMessage ClientHandshaker java 136      at com sun net ssl internal ssl Handshaker processLoop Handshaker java 593      at com sun net ssl internal ssl Handshaker process record Handshaker java 529      at com sun net ssl internal ssl SSLSocketImpl readRecord SSLSocketImpl java 893      at com sun net ssl internal ssl SSLSocketImpl performInitialHandshake SSLSocketImpl java 1138      at com sun net ssl internal ssl SSLSocketImpl startHandshake SSLSocketImpl java 1165      at com sun net ssl internal ssl SSLSocketImpl startHandshake SSLSocketImpl java 1149      at com sun mail util SocketFetcher configureSSLSocket SocketFetcher java 549      at com sun mail util SocketFetcher startTLS SocketFetcher java 486      at com sun mail smtp SMTPTransport startTLS SMTPTransport java 1902          7 more Caused by  sun security validator ValidatorException  PKIX path building failed  sun security provider certpath SunCertPathBuilderException  unable to find valid certification path to requested target     at sun security validator PKIXValidator doBuild PKIXValidator java 323      at sun security validator PKIXValidator engineValidate PKIXValidator java 217      at sun security validator Validator validate Validator java 218      at com sun net ssl internal ssl X509TrustManagerImpl validate X509TrustManagerImpl java 126      at com sun net ssl internal ssl X509TrustManagerImpl checkServerTrusted X509TrustManagerImpl java 209      at com sun net ssl internal ssl X509TrustManagerImpl checkServerTrusted X509TrustManagerImpl java 249      at com sun net ssl internal ssl ClientHandshaker serverCertificate ClientHandshaker java 1185          17 more Caused by  sun security provider certpath SunCertPathBuilderException  unable to find valid certification path to requested target     at sun security provider certpath SunCertPathBuilder engineBuild SunCertPathBuilder java 174      at java security cert CertPathBuilder build CertPathBuilder java 238      at sun security validator PKIXValidator doBuild PKIXValidator java 318          23 more

User · Answer

After a full day of search  I disabled Avast for 10 minutes and Windows Firewall  important  and everything started working   This was my error   Mail server connection failed  nested exception is javax mail MessagingException  Could not convert socket to TLS  nested exception is  javax net ssl SSLHandshakeException  sun security validator ValidatorException  PKIX path building failed  sun security provider certpath SunCertPathBuilderException  unable to find valid certification path to requested target  Failed messages  javax mail MessagingException  Could not convert socket to TLS  nested exception is  javax net ssl SSLHandshakeException  sun security validator ValidatorException  PKIX path building failed  sun security provider certpath SunCertPathBuilderException  unable to find valid certification path to requested target     Here is how to fix the issue in Avast 19 8 2393 by adding an exclusion to SMTP port 587  or whichever port your application uses     Open Avast Click on  Settings   Click on  Troubleshooting  and then  Open old settings       Click again on  Troubleshooting   scroll down to  Redirect settings  and delete the port that your app uses      In my case  I just removed 587 from SMTP ports   Now I am able to use Avast and also have my Windows Firewall switched on  no need to add additional exclusion for the Firewall    Here are my application properties e-mail properties          I am using a Google App Password which I generated in my Gmail Security settings        spring mail host   smtp gmail com spring mail port   587 spring mail protocol   smtp spring mail username   gmail account spring mail password   password spring mail properties mail smtp auth true spring mail properties mail smtp starttls enable true spring mail properties mail smtp connectiontimeout 5000 spring mail properties mail smtp timeout 5000 spring mail properties mail smtp writetimeout 5000

User · Answer

Check the version of your JavaMail lib  mail jar or javax mail jar   Maybe you need a newer one  Download the newest version from here  https   javaee github io javamail

User · Answer

props put  mail smtp ssl trust    smtp gmail com

User · Answer

Yes  it works for me on localhost  props put  quot mail smtp ssl trust quot    quot smtp gmail com quot     The error is only thrown on localhost  so you should try on remote servers too  Usually  it is the snippet of code mentioned above that works well without ssl trust property

User · Answer

This can also be if the application does not support the TLS version the SMTP host is using   For example  trying to configure an SMTP server that uses TLSv1 2 without fallback  when your application or java program using an older javax mail JAR  supports only upto TLSv1 1

User · Answer

I disabled avast antivirus for 10 minutes and get it working

User · Answer

Here is the working solution bro  It s guaranteed  1  First of all open your gmail account from which you wanted to send mail  like in you case   xyz gmail com   2  open this link below https   support google com accounts answer 6010255 hl en  3  click on  Go to the  Less secure apps  section in My Account   option  4  Then turn on it  5  that s it     here is my code  import javax mail    import javax mail internet    import java util     public class SendEmail       final String senderEmailID    Sender Email id   final String senderPassword    Sender Pass word   final String emailSMTPserver    smtp gmail com   final String emailServerPort    465   String receiverEmailID   null  static String emailSubject    Test Mail   static String emailBody         public SendEmail String receiverEmailID  String emailSubject  String emailBody    this receiverEmailID receiverEmailID  this emailSubject emailSubject  this emailBody emailBody  Properties props   new Properties    props put  mail smtp user  senderEmailID   props put  mail smtp host   emailSMTPserver   props put  mail smtp port   emailServerPort   props put  mail smtp starttls enable    true    props put  mail smtp auth    true    props put  mail smtp socketFactory port   emailServerPort   props put  mail smtp socketFactory class   javax net ssl SSLSocketFactory    props put  mail smtp socketFactory fallback    false    SecurityManager security   System getSecurityManager    try   Authenticator auth   new SMTPAuthenticator    Session session   Session getInstance props  auth   MimeMessage msg   new MimeMessage session   msg setText emailBody   msg setSubject emailSubject   msg setFrom new InternetAddress senderEmailID    msg addRecipient Message RecipientType TO  new InternetAddress receiverEmailID    Transport send msg   System out println  Message send Successfully        catch  Exception mex    mex printStackTrace        public class SMTPAuthenticator extends javax mail Authenticator   public PasswordAuthentication getPasswordAuthentication     return new PasswordAuthentication senderEmailID  senderPassword           public static void main String   args           SendEmail mailSender          mailSender   new SendEmail  Receiver Email id   Testing Code 2 example   Testing Code Body yess

User · Answer

In my case the problem was solved by deleting the line  prop put  mail smtp starttls enable    true      It may be because of some ssl configuration errors on email server  I m not sure  Email server administrators never admit it and always blame hosting provider

User · Answer

Try using the smtpsend program that comes with JavaMail  as described here   If that fails in the same way  there s something wrong with your JDK configuration or your network configuration

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Make sure your antivirus program isn t interfering and be sure to add an exclusion to your firewall

User · Answer

If your context is android application    then make sure your android device time is set to current date and time   The underlying exception is   The SSL certificates was not getting authenticated

User · Answer

above application properties worked amazing for me  spring mail properties mail smtp starttls enable true spring mail properties mail smtp starttls required true spring mail properties mail smtp auth true spring mail properties mail smtp ssl trust smtp gmail com

User · Answer

Try changing the port to 465  mail smtp socketFactory port 465 mail smtp port 465

User · Answer

I got similar problem when default SSL protocol for sending emails was set to TLSv1 and smtp server was not supporting this protocol anymore  Trick was to use newer protocol  mail smtp ssl protocols TLSv1 2

User · Answer

What helped me fix this  and i have tried everything before this  was to configure my installed jre to JRE 1 8     Steps in Eclipse   Windows preferences java installed JRE jre1 8 0   If it is set to jdk  switch to jre which is what is supposed to be set to by default with the latest java version

User · Answer

The first answer from  carlos worked for me   session getProperties   put  mail smtp ssl trust    smtp gmail com      I have tested the property below and worked perfectly for me too   session getProperties   put  mail smtp starttls enable    true      The two properties alone solved this type of problem  but by guarantee I used both

[java] Javamail Could not convert socket to TLS GMail

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