From: Dennis Putnam (Dennis.Putnamaimaudit.com)
Date: Thu Sep 27 2007 - 08:53:40 CDT

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Thanks for the reply. As I mentioned in a previous response to
another contributer, I may not have bee clear enough. First I think
here are 2 servers involved and the clients are irrelevant. The error
is occuring between the sender's server and my (recipient's) server.

It is certainly possible there is a lookup delay on the sender's
server but I need a better definition of what the error is and some
way to determine which server is generating the error.

I can add that the error message the sender gets comes from the
MAILER-DAMON on the sender's side. Can I draw any conclusions from
that? I looked at my postfix log at the time the message was bounced
and cannot find any attempt from that server to contact mine. I have
to assume that it was not my server that produced that error but
rather the sender's server and it was unable to find my server's
address for some reason.

On Sep 27, 2007, at 9:44 AM, Harry Hoffman wrote:

> Hi Dennis,
>
> If it's intermittent then a possible cause maybe a lookup table is
> taking to long to respond.
>
> It sounds like it's on the mail server and not the clients end as
> the clients are getting a 500 error.
>
> HTH,
> Harry
>
> Dennis Putnam wrote:
>> I am getting complains from senders saying their mail is
>> undeliverable. What is not clear is what server (the sender's or
>> the receiver's) is generating the error. In any case I have no
>> idea what it means. Can someone help? TIA.
>>> The following message to <mymailboxmydomain.com
>>> <mailto:mymailboxmydomain.com>> was
>>> undeliverable. The reason for the problem: 5.1.0 - Unknown
>>> address error
>>> 500-'Firewall Error'
>> I should note that this is intermittent as some mail gets through
>> and it is only this sender's domain that has the problem. That
>> implies to me that the problem is on the sender's server but I
>> need more information.

Dennis Putnam
Sr. IT Systems Administrator
AIM Systems, Inc.
11675 Rainwater Dr., Suite 200
Alpharetta, GA 30004
Phone: 678-240-4112
Main Phone: 678-297-0700
FAX: 678-297-2666 or 770-576-1000
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