Fixing Javamail TLS Error for GMail

If you're encountering a Javamail TLS error while trying to send emails using GMail, don't worry - there's a solution!

First, ensure that you have the latest version of Javamail installed and that you're using the correct GMail SMTP settings. These settings include using port 587, enabling TLS encryption, and providing your GMail email address and password.

If you've double-checked these settings and are still experiencing the TLS error, you may need to adjust your Java security settings. You can do this by adding the following code to your Java application:

Properties props = System.getProperties();
props.setProperty("mail.smtp.ssl.enable", "true");
props.setProperty("mail.smtp.ssl.trust", "smtp.gmail.com");

This code sets the SSL properties for your SMTP connection to GMail, allowing for secure communication.

Additionally, you may need to add the GMail server certificate to your Java keystore. You can do this using the following command:

keytool -import -alias smtp.gmail.com -keystore "$JAVA_HOME/lib/security/cacerts" -file "/path/to/certificate"

Be sure to replace "/path/to/certificate" with the file path of the GMail server certificate.

With these adjustments, you should be able to send emails using Javamail and GMail without encountering any TLS errors. Happy coding!