On Tue, Jun 09, 2015 at 08:44:20PM -0700, Jithesh AP wrote:
> Currently sending mail is thru port 25, how to make it to use port 587 (i
> understand that is more secure).
Port 587 is not for inter-domain mail delivery. It is for submission
of mail by users (Outlook, Thunderbird, ...) to the outbound SMTP
server of their domain. If you're operating an MTA that sends mail
directly to remote domains, you MUST NOT use port 587.
For more help explain what you're using your Postfix MTA for
and post more detail of the configuration.
http://www.postfix.org/DEBUG_README.html#mail
--
Viktor.
