Re: Email being rejected

Colin:

The bounce reply seemed to indicate an authentication error. If the sending server tried to authenticate to your SBS server (a configuration on their end) and failed, SBS would throw this even if it allows anonymous sending. It would see it as an attempt to relay. They could've realized the misconfiguration and changed it. The only way you could find this is to check your SMTP logs and look for authentication errors around the time of the sent message, and verify it was their IP.

-Cliff

"Colin" <Colin@xxxxxxxx> wrote in message news:D59644F5-B68F-4C40-8DAC-9D5B8E7C5EF4@xxxxxxxxxxxxxxxx
Hi Teneo,

These 2 companies have been exchanging email for 8 months +. It's weird that this problem occurred one Friday and then disappeared the following Monday. The deny message was issued by my client's SBS box but I've no idea why. Like I say, the problem has resolved itself but I'm curious as to why this occurred in the first place. Thanks for the reply.

Regards Colin.

"Teneo" <not@xxxxxxxx> wrote in message news:uZ56x6axIHA.2292@xxxxxxxxxxxxxxxxxxxxxxx
Hi Colin, initially I think it is their end. They must have some spam system blocking you.


"Colin" <Colin@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote in message news:A9D9FE16-80C7-4AD1-8CFF-FA2039191DA9@xxxxxxxxxxxxxxxx
Hi all,

One of my client's SBS 2003 Standard R2 (no SP2) boxes started rejecting
mail 3 days ago. The following error was sent back to the guys trying to send
mail to us:

Your message did not reach some or all of the intended recipients.
Subject: Auction List
Sent: 30/05/2008 15:02
The following recipient(s) could not be reached:
anna@xxxxxxxxxxxxx on 30/05/2008 15:03
There was a SMTP communication problem with the recipient's email server.
Please contact your system administrator.
<externalcompany.local #5.5.0 smtp;571 Delivery not authorized, message
refused>

email seems to be working fine now but nothing has changed. Anyone know why
this problem may have occurred ?

Regards Colin.




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