Could not connect to SMTP host smtp gmail com port 465 response -1

Question

while sending mail I am getting this error     java lang RuntimeException  javax mail SendFailedException  Sending   failed    nested exception is     class javax mail MessagingException    Could not connect to SMTP host  smtp gmail com  port  465  response    -1   my code is   Properties props   new Properties    props put  mail smtp host    smtp gmail com    props put  mail smtp starttls enable   true    props put  mail smtp socketFactory port    465    props put  mail smtp auth    true    props put  mail smtp port    465     Session session   Session getDefaultInstance props          new javax mail Authenticator                     protected PasswordAuthentication getPasswordAuthentication                             return new PasswordAuthentication  email   password                                   try            Message message   new MimeMessage session           message setFrom new InternetAddress  email             message setRecipients Message RecipientType TO                          InternetAddress parse this to            message setSubject  Testing            message setText  Hey  this is the testing email                Transport send message     Any help would be appreciated   Thanks in Advance

User · Answer

What i did was i commented out the   props put  mail smtp starttls enable   true       Because apparently for G-mail you did not need it  Then if you haven t already done this you need to create an app password in G-mail for your program  I did that and it worked perfectly  Here this link will show you how  https   support google com accounts answer 185833

User · Answer

I have been experiencing this issue when debugging using NetBeans  even executing the actual jar file  Antivirus would block sending email  You should temporarily disable your antivirus during debugging or exclude NetBeans and the actual jar file from being scanned  In my case  I m using Avast    See this link on how to Exclude   How to Add File Website Exception into avast  Antivirus 2014  It works for me

User · Answer

Port 465 is for  smtp over SSL    http   javamail kenai com nonav javadocs com sun mail smtp package-summary html        For example  use     props put  mail smtp port    888    to set the mail smtp port property  which is of type int   Note that if you re using the  smtps  protocol to access SMTP over SSL   all the properties would be named  mail smtps

User · Answer

You need to tell it that you are using SSL   props put  mail smtp socketFactory class    javax net ssl SSLSocketFactory      In case you miss anything  here is working code   String  d email    address gmail com               d uname    Name               d password    urpassword               d host    smtp gmail com               d port     465               m to    toAddress gmail com               m subject    Indoors Readable File      params 0  getName                m text    This message is from Indoor Positioning App  Required file s  are attached        Properties props   new Properties        props put  mail smtp user   d email       props put  mail smtp host   d host       props put  mail smtp port   d port       props put  mail smtp starttls enable   true        props put  mail smtp debug    true        props put  mail smtp auth    true        props put  mail smtp socketFactory port   d port       props put  mail smtp socketFactory class    javax net ssl SSLSocketFactory        props put  mail smtp socketFactory fallback    false         SMTPAuthenticator auth   new SMTPAuthenticator        Session session   Session getInstance props  auth       session setDebug true        MimeMessage msg   new MimeMessage session       try           msg setSubject m subject           msg setFrom new InternetAddress d email            msg addRecipient Message RecipientType TO  new InternetAddress m to     Transport transport   session getTransport  smtps                transport connect d host  Integer valueOf d port   d uname  d password               transport sendMessage msg  msg getAllRecipients                 transport close               catch  AddressException e                e printStackTrace                return false            catch  MessagingException e                e printStackTrace                return false

User · Answer

In my case it was Avast Antivirus interfering with the connection  Actions to disable this feature  Avast -  Settings-  Components -  Mail Shield  Customize  -  SSL scanning -  uncheck  Scan SSL connections

[java] Could not connect to SMTP host: smtp.gmail.com, port: 465, response: -1

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