Must issue a STARTTLS command first

Question

I am running this simple example with my Gmail account  but its not working and giving the following error         send failed  exception  com sun mail smtp SMTPSendFailedException  530 5 7 0 Must issue a STARTTLS command first  nv2sm4478384pbb 6         Here is my code     public class Email      public static void main String    args               Properties props   new Properties            props put  mail smtp host    smtp googlemail com            props put  mail from    myemail gmail com              Session session   Session getInstance props  null            try               MimeMessage msg   new MimeMessage session               msg setFrom                msg setRecipients Message RecipientType TO                                 myemail hotmail com                msg setSubject  JavaMail hello world example                msg setSentDate new Date                 msg setText  Hello  world  n                Transport send msg             catch  MessagingException mex                System out println  send failed  exception      mex

User · Answer

String username    mail google com       String password    some-password       String recipient    myemail hotmail com         Properties props   new Properties         props put  mail smtp host    smtp gmail com        props put  mail from    myemail gmail com        props put  mail smtp starttls enable    true        props put  mail smtp port    587        props setProperty  mail debug    true         Session session   Session getInstance props  null       MimeMessage msg   new MimeMessage session        msg setRecipients Message RecipientType TO  recipient       msg setSubject  JavaMail hello world example        msg setSentDate new Date         msg setText  Hello  world  n         Transport transport   session getTransport  smtp         transport connect username  password       transport sendMessage msg  msg getAllRecipients         transport close

User · Answer

Try this code    Properties props   new Properties                            props put  mail smtp host    smtp gmail com                            props put  mail smtp socketFactory port    465                            props put  mail smtp socketFactory class    javax net ssl SSLSocketFactory                            props put  mail smtp auth    true                            props put  mail smtp prot    465                             Session session   Session getDefaultInstance props                                  new javax mail Authenticator                                 protected PasswordAuthentication getPasswordAuthentication                                      return new PasswordAuthentication  PUT THE MAIL SENDER HERE      PUT THE PASSWORD OF THE MAIL SENDER HERE                                                                                                                 try                               Message message   new MimeMessage session                               message setFrom new InternetAddress  PUT THE MAIL SENDER HERE                                   message setRecipients Message RecipientType TO  InternetAddress parse  PUT THE MAIL RECEIVER HERE                                   message setSubject  MAIL SUBJECT                                  message setText  MAIL BODY                                  Transport send message                              catch  Exception e                                JOptionPane showMessageDialog null  e                               You have to less secure the security of the mail sender  if the problem persist I think It can be caused by the antivirus  try to disable it

User · Answer

I also faced the same issue while I was building email notification application   you just need to add one line  Below one saved my day   props put  mail smtp starttls enable    true      com sun mail smtp SMTPSendFailedException  530 5 7 0 Must issue a STARTTLS command first  h13-v6sm10627790pgp 13 - gsmtp  at com sun mail smtp SMTPTransport issueSendCommand SMTPTransport java 2108  at com sun mail smtp SMTPTransport mailFrom SMTPTransport java 1609  at com sun mail smtp SMTPTransport sendMessage SMTPTransport java 1117  at javax mail Transport send0 Transport java 195  at javax mail Transport send Transport java 124  at com smruti email EmailProject EmailSend main EmailSend java 99    Hope this helps you

User · Answer

You are probably attempting to use Gmail s servers on port 25 to deliver mail to a third party over an unauthenticated connection  Gmail doesn t let you do this  because then anybody could use Gmail s servers to send mail to anybody else  This is called an open relay and was a common enabler of spam in the early days  Open relays are no longer acceptable on the Internet   You will need to ask your SMTP client to connect to Gmail using an authenticated connection  probably on port 587

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Google now has a feature stating that it won t allow insecure devices to send emails  When I ran my program it came up with the error in the first post  I had to go into my account and allow insecure apps to send emails  which I did by clicking on my account  going into the security tab  and allowing insecure apps to use my gmail

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smtp port and socketFactory has to be change       String to    reciveremail xxxx xxx       String subject    subject      String msg   email text          final String from   senderemail gmail com      final  String password   senderPassword        Properties props   new Properties          props setProperty  mail transport protocol    smtp             props setProperty  mail host    smtp gmail com          props put  mail smtp auth    true          props put  mail smtp port    465          props put  mail debug    true          props put  mail smtp socketFactory port    465          props put  mail smtp socketFactory class   javax net ssl SSLSocketFactory          props put  mail smtp socketFactory fallback    false          Session session   Session getDefaultInstance props        new javax mail Authenticator            protected PasswordAuthentication getPasswordAuthentication              return new PasswordAuthentication from password                           session setDebug true        Transport transport   session getTransport         InternetAddress addressFrom   new InternetAddress from         MimeMessage message   new MimeMessage session        message setSender addressFrom        message setSubject subject        message setContent msg   text plain         message addRecipient Message RecipientType TO  new InternetAddress to          transport connect         Transport send message        transport close             hope it will work for you

User · Answer

Adding  props put  mail smtp starttls enable    true      solved my problem     My problem was    com sun mail smtp SMTPSendFailedException  530 5 7 0 Must issue a STARTTLS command first  u186sm7971862pfu 82 - gsmtp  at com sun mail smtp SMTPTransport issueSendCommand SMTPTransport java 2108  at com sun mail smtp SMTPTransport mailFrom SMTPTransport java 1609  at com sun mail smtp SMTPTransport sendMessage SMTPTransport java 1117  at javax mail Transport send0 Transport java 195  at javax mail Transport send Transport java 124  at com example sendmail SendEmailExample2 main SendEmailExample2 java 53

[java] Must issue a STARTTLS command first

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