On Mit, 2010-05-05 at 15:38 +0300, Alans wrote:
[...]
> Actually we are seeking a solution to our problem which is sending spam
> through our network.
> We are about to close port 25 and tell customers to switch to our smtp relay
> and scan it with spamassasin (I still don't know if possible or no!).

Why shouldn't it be possible?
SpamAssassin doesn't care where the mail comes from and where it will be
forwarded/sent/stored afterwards.
If an email is "incoming" or "outgoing" is only a question of your setup
(and thus MTA configuration).

> We want to reject all spam emails and send notification back to sender about
> his/her activity.

As ram said, you probably will want to use different rule sets.

        Bernd
-- 
Bernd Petrovitsch                  Email : be...@petrovitsch.priv.at
                     LUGA : http://www.luga.at

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