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

RE: Fighting Backscatter

From: Steve Jenkins <steve_at_nospam>
Date: Mon Oct 18 2010 - 17:58:46 GMT
To: "Postfix users" <postfix-users@postfix.org>

So, Cox rejects the message to me, and then I'm sending it back to an
innocent person?

SJ

-----Original Message-----
From: owner-postfix-users@postfix.org
[mailto:owner-postfix-users@postfix.org] On Behalf Of Wietse Venema
Sent: Friday, October 15, 2010 2:05 PM
To: Postfix users
Subject: Re: Fighting Backscatter

Steve Jenkins:
> Hi, Wietse. Thanks for the speedy reply. I'm a big fan of Postfix, so
first
> of all, thank you for developing such a great product. I cringe thinking
> about the days when I used to have to run Sendmail (shudder).
>
> Ok... so let me see if I understand what is happening on my server.
>
> 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) Cox.net rejects the mail because it's SPAM and sends it back to the
> spoofed "sender": innocent@victim.com, basically saying "your message to
> myaunt@familyname.com was rejected because of xyz reason"

Cox rejects the message; YOUR box sends it back to an innocent person.

        Wietse