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From: Olivier Nicole (Olivier.Nicolecs.ait.ac.th)
Date: Tue Nov 10 2009 - 20:31:27 CST
> Hello list! We are being blacklisted every few days from verizon. This is
> less important right now as I need to find out if/who is sending spam from
> the email server or if the server is an open relay. I am less inclined to
> think postfix (which is what we use) is an open relay. More inclined to
> think someone has gotten an account is sending spam out using the server.
> What is the best way to find out who/if an account is sending spam from the
At same time you can try to talk to Verizon, asking them what message
caused the blacklisting. Having the message ID of the spam may help
identifying your spammer.