From: Dennis Putnam (Dennis.Putnamaimaudit.com)
Date: Thu Sep 27 2007 - 08:39:35 CDT

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Thanks for the reply. If it were really a port blocking issue would
not the error be consistent? Also are you implying the error is on
the sender's side?

Just so we are clear which way to look at it, my server is the
receiver. The sender is getting the error in their bounced mail. It
is unlikely their IT dept will do anything without some definitive
proof of where the problem is.

Since our business is dependent on this mail I am stuck trying to
resolve the issue. If it is on the sender's side I need to have
enough information to give them so they will accept the problem. If
it is on my side then I need to understand the problem so I can fix it.

On Sep 27, 2007, at 9:24 AM, Matthias Schmidt wrote:

> Am/On Thu, 27 Sep 2007 09:19:09 -0400 schrieb/wrote Dennis Putnam:
>
>> 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> 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.
>
> they might have blocked the smtp port 25.
> Ask the user to use the submission port 587 and configure postfix
> accordingly.
> Here is how you change master.cf:
>
> submission inet n - n - - smtpd
> -o smtpd_enforce_tls=no
> -o smtpd_sasl_auth_enable=yes
> -o smtpd_client_restrictions=permit_sasl_authenticated,reject
>
> to enable the submission port.
>
>
> Thanks and all the best
>
> Matthias
>
>

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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