Mailing List Message #6208
From: Bill Cole <>
Subject: Re: rejection from DNS configuration?
Date: Mon, 12 Jun 2000 09:42:54 -0400
To: SIMS Discussions <>
At 8:26 PM -0400 6/10/00, Stonewall Ballard  imposed structure on a stream of electrons, yielding:
>I just got this rejection:
>19:27:27 4 SMTP-312([]) Input Line: EHLO\r
>19:27:27 4 SMTP-312( Looking for
>19:27:27 4 SMTP-312( Sending is
>pleased to meet you\r\n250-HELP\r\n250-PIPELINING\r\n250-ETRN\r\n250
>19:27:28 4 SMTP-312( Input Line: MAIL
>19:27:28 1 SMTP-312( Return-Path-MX Search Error.
>Error Code=-3211
>19:27:28 4 SMTP-312( Sending 572
><> cannot be
>accepted: DNS Error\r\n
>The problem seems to be that <> is a
>CNAME for <>, which is a CNAME for
><>. That's unusual, and possibly illegal.

It is illegal, assuming you mean the 'laws' of DNS. It means that any
standard-compliant mailer using a standards-compliant name resolver will
be unable to send mail to that Return-Path, which is a Very Bad Thing. I
assume this is a mailing list of some sort, and they are running it in a
way that means that bounces will not be processed. This is EXTREMELY bad.
It could end up in an appearance of intentional attempts to mail people
who do not want the mail.

Incidentally, what is the 0xdeadbeef list? I know that hex value has been
used by multiple system vendors as a 'bad value' and Apple is one of those
vendors. The name is a bit intriguing...

> Will that
>cause SIMS to reject the email?

Yes, assuming 'Check Return-Paths' is on.

>Is there any way to make SIMS accept this email without disabling my
>spam protection?

You could special-case the domain name in the router: =

Note that if you are sending any mail to *
this will rewrite the envelope, but I suspect that if you are sending mail
to such an address it is getting bounced in SIMS anyway. You may need to
do this instead: =

I *THINK* that will avoid rewriting the envelope. You could also be more
specific about the rule:

<> = <>

or even:

<> = <>

I am sure you can probably think of possibly useful ways to wildcard that
as necessary if there are other addresses in that domain you need to
accept as valid.

Bill Cole                                  
MAPS L.L.C. Consulting Services Group (work) (personal)
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