Sending an email via Gmail SMTP using JavaMail results in a TLS socket error. Use this alternate sample:
String userEmail = "[email protected]";
String userPass = "examplepass";
Properties config = new Properties();
config.put("mail.smtp.auth", "true");
config.put("mail.smtp.starttls.enable", "true");
config.put("mail.smtp.host", "smtp.gmail.com");
config.put("mail.smtp.port", "587");
Session mailSession = Session.getInstance(config, new javax.mail.Authenticator() {
protected PasswordAuthentication retrieveAuth() {
return new PasswordAuthentication(userEmail, userPass);
}
});
try {
MimeMessage emailMsg = new MimeMessage(mailSession);
emailMsg.setFrom(new InternetAddress("[email protected]"));
emailMsg.addRecipient(Message.RecipientType.TO, new InternetAddress("[email protected]"));
emailMsg.setSubject("Email Test");
emailMsg.setText("Hello, please check this email transmission.");
Transport.send(emailMsg);
} catch (MessagingException ex) {
ex.printStackTrace();
}
i fixed it by tryng port 465 and adding mail.smtp.ssl.protocols=TLSv1.2. check your jdk’s compatibility if the issue persists. sometimes these small tweaks help solve the tls socket probs
In addressing TLS socket issues with Gmail, I discovered that making minor adjustments to the configuration settings can resolve seemingly persistent problems. I switched to using port 587 with startTLS enabled and ensured that my JavaMail and JDK were fully updated to avoid compatibility issues. Additionally, I tried turning off specific timeouts by setting mail.smtp.quitwait to false, which helped in some cases. Detailed session debugging was also instrumental in isolating errors, allowing me to pinpoint and resolve unexpected behavior during the secure handshake process.
I encountered similar issues and found that explicitly trusting the SSL certificate can resolve the TLS handshake problems. In my case, including the property mail.smtp.ssl.trust with the Gmail SMTP host value proved helpful. I ensured that my JavaMail library was updated because older versions may have strict requirements leading to these issues. Debugging the session also revealed some underlying connection delays. Adjusting these properties and ensuring compatibility with the security settings of the JDK made the TLS handshake reliable in my implementation.
I ran into similar issues with JavaMail and Gmail a while back. It turned out that a slight misconfiguration in properties and issues related to local firewall settings was at play. I ended up double-checking that my system’s time was accurate and that no proxy or local network policies were interfering. It was also useful to temporarily enable session debugging to watch the handshake process and identify where the failure occurred. Once these details were sorted out, the TLS connection became stable.
In my experience, after exploring several configuration tweaks, I resolved similar TLS socket issues by explicitly enabling SSL while retaining the startTLS setting. I added the property mail.smtp.ssl.enable set to true, and also configured appropriate connection timeouts to prevent delays from interfering with the handshake. Updating both the JavaMail library and my JDK to their latest versions helped ensure that older security protocols were not causing conflicts. Moreover, I verified that there were no external network security measures like antivirus or firewall rules blocking the handshake process, which finally stabilized the connection.