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We do not relay.....ok, but....

Posted on 2005-03-31
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Last Modified: 2010-08-05
I have one user, who when he sends an email to a guy on our BOD, he always receives this NDR:

Your message did not reach some or all of the intended recipients.

      Subject:      FW: Trunk Monkeys
      Sent:      3/31/2005 2:17 PM

The following recipient(s) could not be reached:

      <HeadHonchosName>  (E-mail) on 3/31/2005 2:19 PM
            There was a SMTP communication problem with the recipient's email server.  Please contact your system administrator.
            <mail.<mycompany>.com #5.5.0 smtp;571 from MY.MailServers.Public.IP We do not relay>

I can't tell if this is an issue on our server or theirs....And yes, I have it locked down so there is no relaying allowed on our server.  Ideas?
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Question by:tenover
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by:jjoseph_x
ID: 13677662
If the message is originating from your server (and it looks like it is), the problem would appear to be on your side.

Technically you email server needs to allow relaying to be able to send mail to any outside address, but you'd only allow relaying for your local subnet.
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by:tenover
ID: 13682680
But this ONLY happens when sending email to this one single outside guy......Anyone know how I can find out if it in fact on our side or theirs, and how to remedy it?  Thanks.
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jjoseph_x earned 2000 total points
ID: 13682902
Where's the messaging coming from?  If it's coming from your server, then it would be on your side (but that wouldn't make sense if it only happens for one guy).  However, if it's on their end, they might have a mail gateway (that forwards the messages to their "main" mail server) that's incorrectly configured.
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Author Comment

by:tenover
ID: 13683191
Both of our sites have single Exchange servers with no gateways or out of the ordinary restrictions......The end of the error says "We do not relay", which is odd, because it that implies that this one external user is maybe forwarding or POPing his email from another domain or something, no?
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Expert Comment

by:nymag
ID: 14381811
i have the same problem.  anyone have an answer?
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