postfix-users October 2010 archive
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postfix-users: Re: Fighting Backscatter

Re: Fighting Backscatter

From: Wietse Venema <wietse_at_nospam>
Date: Mon Oct 18 2010 - 18:06:52 GMT
To: Postfix users <postfix-users@postfix.org>

> 1) SpamCo forges a message from innocent@victim.com and sends it to
> myaunt@familyname.com
>
> 2) My server (familyname.com) accepts the message because
> myaunt@familyname is a valid recipient that appears in my virtual
> aliases file, then forwards the message (based on the info in that
> virtual aliases file) to my aunt's actual email address of
> auntiemildredloveskitties@cox.net

3) YOUR SERVER tries to forward the SPAM to Cox.

4) Cox rejects the SPAM.

5) The SPAM is still on YOUR SERVER.

6) YOUR SERVER "returns" the SPAM to an innocent person.

7) YOUR SERVER is blacklisted because it sends backscatter.

        Wietse