Re: unexpected UNDELIVERED MAIL

From: hvdkooij@vanderkooij.org
Date: 11/30/01 

Date: Fri, 30 Nov 2001 19:44:13 +0100 (CET)
From: <hvdkooij@vanderkooij.org>
To: Focus on Linux Mailing List <focus-linux@securityfocus.com>
Subject: Re: unexpected UNDELIVERED MAIL
Message-ID: <Pine.LNX.4.33.0111301939500.12592-100000@ultra1.hugo.vanderkooij.org>

On Fri, 30 Nov 2001, Eric Santonacci wrote:

> Since a week, I'm receiving undelivered email notification for mail I didn't
> send neither someone in my domain. I though that someone (spammer)has hacked
> my SMTP server but it seems, they are just using my domain name as mail appear
> to come from. Is there any possiblity to stop that , to know who does this or
> something else against this practice? Except filtering incoming mail.

Anyone faking an email address with your domainname in it's sender part
will result in massive amounts of these messages. In 1 case we got about
100000 messages to a non-existing email adres due to such a fake. I
wouldn't dare to guess the amount hotmail.com will get from faked hotmail
senders in spam.

Hugo. 

-- 
All email send to me is bound to the rules described on my homepage.
    hvdkooij@vanderkooij.org		http://hvdkooij.xs4all.nl/
	    Don't meddle in the affairs of sysadmins,
	    for they are subtle and quick to anger.

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