[Java Mail] com.sun.mail.smtp.SMTPSendFailedException: 530 5.7.0 Must issue a STARTTLS command first.

Problem
I am using gmail as my testing mail server to test Java Mail code.
Here is my test code:

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import javax.mail.MessagingException; import javax.mail.internet.MimeMessage; import org.springframework.mail.javamail.JavaMailSenderImpl; import org.springframework.mail.javamail.MimeMessageHelper; public class MailTest { public static void main(String[] args) { String host = "smtp.gmail.com"; int port = 587; String userName = "xxx"; String password = "xxx"; String mailTo = "xxx@gmail.com"; String subject = "Hello my friend~"; JavaMailSenderImpl sender = new JavaMailSenderImpl(); sender.setHost(host); sender.setPort(port); sender.setUsername(userName); sender.setPassword(password); MimeMessage message = sender.createMimeMessage(); MimeMessageHelper helper; try { helper = new MimeMessageHelper(message, true); helper.setTo(mailTo); helper.setSubject(subject); helper.setText("test test"); } catch (MessagingException e) { throw new RuntimeException(e); } sender.send(message); } }

But as I run this test code, it throw exception as bellows:

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com.sun.mail.smtp.SMTPSendFailedException: 530 5.7.0 Must issue a STARTTLS command first. wb7sm14621901pab.3 - 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 org.springframework.mail.javamail.JavaMailSenderImpl.doSend(JavaMailSenderImpl.java:448) at org.springframework.mail.javamail.JavaMailSenderImpl.send(JavaMailSenderImpl.java:345) at org.springframework.mail.javamail.JavaMailSenderImpl.send(JavaMailSenderImpl.java:340) at albert.practice.mail.MailTest.main(MailTest.java:52)

How-to
We need to enables the use of the STARTTLS command to switch the connection to a TLS-protected connection before issuing any login commands. 

Therefore, the source code would be modified as following:

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import java.util.Properties; import javax.mail.MessagingException; import javax.mail.internet.MimeMessage; import org.springframework.mail.javamail.JavaMailSenderImpl; import org.springframework.mail.javamail.MimeMessageHelper; public class MailTest { public static void main(String[] args) { Properties props = new Properties(); props.put("mail.smtp.starttls.enable", "true"); String host = "smtp.gmail.com"; int port = 587; String userName = "xxx"; String password = "xxx"; String mailTo = "xxx@gmail.com"; String subject = "Hello my friend~"; JavaMailSenderImpl sender = new JavaMailSenderImpl(); sender.setJavaMailProperties(props); sender.setHost(host); sender.setPort(port); sender.setUsername(userName); sender.setPassword(password); MimeMessage message = sender.createMimeMessage(); MimeMessageHelper helper; try { helper = new MimeMessageHelper(message, true); helper.setTo(mailTo); helper.setSubject(subject); helper.setText("test test"); } catch (MessagingException e) { throw new RuntimeException(e); } sender.send(message); }

Test successful !
Reference
[1] http://stackoverflow.com/questions/17581066/using-javamail-with-a-self-signed-certificate