confluence mail send timeout

[Moon Express]

I have JIRA (6.3.1) and Confluence (5.6.5) running on the same host. I am using gmail for my email server (smtp.gmail.com:465 with TLS enabled). Sending email from JIRA works fine, but Confluence generates the error below. I don't think this is an issue with the mail server or the network since the exact same settings work for JIRA from the same machine. Is there something else that could be causing this?

An error has occurred with sending the test email:
com.atlassian.mail.MailException: javax.mail.MessagingException: Exception reading response;
nested exception is:
java.net.SocketTimeoutException: Read timed out
at com.atlassian.confluence.jmx.JmxSMTPMailServer.doSendWithMessageIdSupport(JmxSMTPMailServer.java:143)

[Moon Express]

I was able to solve this problem by adding a JNDI mail resource as described here:

https://confluence.atlassian.com/display/DOC/Setting+Up+a+Mail+Session+for+the+Confluence+Distribution

Configuring the mail server using the Confluence UI did not work.

[Steven Barmoy]

Thanks! I had the exact same issue and that worked for me too!

[Fabian Lang]

Maybe this is a bit late, but i was facing the exact same issue and found this article.

The solution for me was to change the port to 587 and it worked.

[Phu]

Thank you. I changed the port from 456 to 587, and it worked for me as well.

[CSW GmbH]

Worked for me too.... Thanks!

[king flight]

You save my day. Thanks!

[BHoo]

+1, 587 worked pretty well, thanks dude.