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Date: Mon, 17 Sep 2007 15:44:34 -0700
From: Jay Chandler <lists@sequestered.net>
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To: Chris Maness <chris@chrismaness.com>
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Cc: freebsd-questions@freebsd.org
Subject: Re: SMTP Error from my server?
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Chris Maness wrote:
> I have not seen this error before.  What does it mean?  (I will change 
> the actual e-mail to protect the address from spam bots).
>
> To: NOSPAMtim@adelphia.net
>> From: Mail Administrator <Postmaster@<PostmasterDomain>>
>> Subject: Mail System Error - Returned Mail
>> Date: Mon, 17 Sep 2007 14:48:17 -0400
>>
>> This Message was undeliverable due to the following reason:
>>
>> Your message was not delivered because the return address was refused.
>>
>> The return address was "<NOSPAMtim@adelphia.net>"
>>
>> Please reply to Postmaster@<PostmasterDomain>
>> if you feel this message to be in error.
>
> Chris Maness
> Sys Admin

Looks to me like a failed sender verification callout-- these are 
generally construed to be abusive.  I can't easily tell from your 
munging whether it's your server or Adelphia that's doing it, though.

-- 
Jay Chandler / KB1JWQ
Living Legend / Systems Exorcist
Today's Excuse: SCSI Chain overterminated