Check if all the configurations are right. Double check if the email protocol you're using is the right one for your email service, and if the port, host address, username and password are all correct.
You have a different solution? A short tip here would help you and many other users who saw this issue last week.
- javax.mail.AuthenticationFailedException at javax.mail.Transport.send0(Transport.java:218) at javax.mail.Transport.send(Transport.java:80)