On Thu, 17 Feb 2011 17:15:21 +0800
sunhux G <sun...@gmail.com> articulated:

> Does my firewall need to permit SMTP outgoing or just incoming is
> sufficient?

Please don't top post. If you are unfamiliar with that term, Google for
it. While you are at it, could you please post in plain ASCII format.
There is no need for HTML. GMail has a plain text option.

Regarding the port 25 firewall rule, if it is blocked outbound, how
would you expect it to work correctly? Without knowing your firewall
type I cannot help you any further. Personally, I use many "stateful"
rules on my systems; however, that may not be suitable for your
environment.

-- 
Jerry ✌
postfix-u...@seibercom.net
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