Delivery Failure: Emails Bouncing Back to Senders

[itecs]

I have just completely recreated a new AD Domain with Windows 2000 and am using Exchange 2000 on the Domain Controller.

I updated the OS to SP4, installed Exchange 2000 w/Sp3, and configured all neccessary components (dns, dhcp). I also disabled Anonymous access on the SMTP protocol.

The users are able to connect to their respective mailboxes and send successfully. When replying to the test message, utilizing a outside email address, the message will bounce back after 5 minutes stating the follow:

-----------------------------------------------------
Could not deliver message to the following recipient(s):

Failed Recipient: administrator@herringgroup.com
Reason: Remote host said: 454 5.7.3 Client was not authenticated.

-- The header and top 20 lines of the message follows --

MIME-Version: 1.0
Content-Type: text/plain;
charset=iso-8859-1
Date: Mon, 23 Feb 2004 22:34:13 -0600
Subject: re: test222
From: "Brian" <Brian@itecsonline.com>
Reply-To: Brian@itecsonline.com
To: <administrator@herringgroup.com>
CC:

Original Message:
>From: "administrator" <administrator@herringgroup.com>
>To: <brian@itecsonline.com>
>Subject: test222
>Date: Mon, 23 Feb 2004 22:30:20 -0600

>test222
-----------------------------------------------

The DNS MX records are correct, I had a NT server with Exchange 5.5 in production and I just revamped the entire domain to Active Directory.

Any ideas of why my emails to the Exchange 2000 server in a different domain would bounce back with the Delivery Failure?

Thank you very much for your help!

 

[xmsre]

"I also disabled Anonymous access on the SMTP protocol."

5.7.3 = permanent failure - security conversion required but not possible.

Don't disable anonymous access on the protocol. That means that external servers will be required to authenticate to transfer mail to you; which of course they can't. That is exactly what you're seeing in the NDR. You do want to accept anonymous connections; you don't want to relay for them.

To secure against relay:

http://support.microsoft.com/default.aspx?scid=kb;en-us;310380

http://support.microsoft.com/default.aspx?scid=kb;en-us;313395

XMSRE
MOSMWNMTK