Ignition Email Settings - Test email

I need some assistance in determining why I keep getting a Read Timeout error when I setup an email smtp profile. I've tested the SMTP profile on another Ignition systems and it works without issues but when I set it up on this particular ignition gateway I keep getting the following error.

javax.mail.MessagingException: Exception reading response;
nested exception is:
java.net.SocketTimeoutException: Read timed out

That's a common problem if the target mailserver decides you are a spammer--it holds the connection open but doesn't reply, tying up the spamming source.