Mail is only excepted for user_na...@ipadress, and only from google's
server. All port 25 inbound from anywhere where else is rejected at the
firewall level.

>
>> [email protected] => [email protected] (gmail
>> server) => cfrank...@ipaddress (in house server).
>
> Hope bots will NEVER discover your "IPADDRESS" port 25 open or
> your backend mailserver will get a LOT of hard hits from spambots :(
> (no, not kidding, been there, seen that, and while your approach has
> some pros, leaving a port 25 open even if not published by DNS does
> not mean it won't be found by scanbots :P !)
>
>
> ------------------------------------------------------------------------------
> Return on Information:
> Google Enterprise Search pays you back
> Get the facts.
> http://p.sf.net/sfu/google-dev2dev
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>



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