Send Email Action (6.5.0) Not Working

Document ID : KB000071678
Last Modified Date : 12/03/2018
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Issue:
We're trying to send an email using the Send Email Action to  a SMTP email server with STARTTLS enabled , When testing the action, it returns the following error:
Send Failed to send mail javax.mail.MessagingException:  We have added the certificate to the RA Agent's JRE cacerts as well.
Cause:
STARTTLS is not supported 
Resolution:
The current Send Email Action in RA 6.5.* does not support the the STARTTLS feature which starts a connection as 
plain text but tries to elevate the connect to use TLS after initial handshake. 
The action only support a plain text connection or normal SSL connection .