Getting Exchange 2003 to Accept Mail for a Secondary Domain

Mark Berry May 19, 2008

I had a customer some time ago who always spelled out my full company name when sending  me email. I finally registered mcbsystems.com so I could receive her emails.

Since then I've implemented Exchange 2003 (under SBS 2003), but apparently I never tested the domain alias until I was setting up Postini. It turns out that Exchange was bouncing messages sent to the domain with a “550 5.7.1 Unable to relay” message.

My situation  pretty much matches the second “class” of SMTP domain in this Microsoft Knowledge Base article:


Setting up SMTP domains for inbound and relay e-mail in Exchange 2000 Server and in Exchange Server 2003

Howver, whereas the article suggests changing the SMTP connector to allow messages to be relayed
to this domain
, I discovered another option. If I go to Recipient Policies > Default Policy > E-Mail Addresses (Policy) tab, create a policy @mcbsystems.com, and check the box to the left that causes it to auto-generate the address for new Active Directory users, relaying works. If you don't check the box for auto-generating addresses, relaying only works if it is set up in the SMTP connector. I'm not sure what auto-generation of addresses has to do with relaying, but I thought I'd better write this down before I forget it!

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Exchange IMF and Custom Weight Lists

Mark Berry August 9, 2007

One of the features built in to Exchange 2003 SP2 is Intelligent Message Filtering. While this is a major step forward in blocking incoming spam, IMF does have its limitations. The limitation that I have encountered most frequently is the misclassification of some email as spam, and the inability to “whitelist” certain senders without implementing third-party workarounds.

Recently, a contributor to a Yahoo group suggested that it might be possible to use IMF’s built-in Custom Weight List (CWL) functionality to whitelist senders. The theory was that if the CWL’s BODY element has access to the entire email message, including headers, it could be used to allow emails that contain a certain “From:” string.

Today I was able to test this idea. 

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