javax.net.ssl.SSLException when sending mail using JavaMail

Question

javax.mail.MessagingException: Exception reading response;
  nested exception is:
        javax.net.ssl.SSLException: Unrecognized SSL message, plaintext connection?         


        

Answer 1

I was facing this problem when using Gmail.

In order to use Gmail I had to turn ON "Allow less secure apps".

This Gmail setting can be found at https://www.google.com/settings/security/lesssecureapps after login the gmail account.