Date:  Sat, 5 Dec 2009 18:19:03 -0800 (PST)
From:  Dan Kriwitsky <webhosting (at mark) yahoo.com>
Subject:  [coba-e:16183] Re: No such user here
To:  coba-e (at mark) bluequartz.org
Message-Id:  <758062.60309.qm (at mark) web65614.mail.ac4.yahoo.com>
In-Reply-To:  <026f01ca75f6$a20ee450$4001a8c0@Maxwell>
X-Mail-Count: 16183


> I am wondering what (if anything) can be done to prevent
> the server 
> from processing and logging all of these useless
> messages.  I suspect all 
> of these mail requests are generating significant data
> transfer.  Is it 
> simply a fact of life or can some component of the mail
> system be optimized to 
> stop it? 
>  

One way to take action would be to sign up with Spamcop. Create a catchall for the domain for a couple of hours. Collect the bounces and file spamcop reports. The domains sending the "bounces" should not be doing so. Most likely the bounces are the result of mis-configured servers that are not properly sending a 550 and are doing accept-then-bounce. That is spam.
http://www.spamcop.net/fom-serve/cache/329.html#bounceexplain

http://www.spamhaus.org/faq/answers.lasso?section=Glossary#179

-- 
Dan Kriwitsky