email sent to pop3 account rec'd, smtp account no, ...

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System is SBS 2003. Half of internal email accounts get mail through pop3 connector, other half through SMTP. All email accounts with same domain extension. Setup this reason prior to my arrival (unknown exactly why).

A particular outside sender (Bob, and only Bob), sends an email to an account that is configured to use the pop3 connector, reception occurs. When bob sends to a user that is not configured to use the pop3 connector, he gets a user unavailable message and delivery does not occur. Sorry, exact wording of Bob's error message is missing right now, I'll get details tomorrow. Otherwise, all sending and recieving is working just fine, just a problem receiving from Bob.

Idea's as to where I should start looking?

Robin

 

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I think I have a good idea where to start looking. Anyone who knows better, please chime in.

I understand with the pop3 connector, these messages are not processed by any of the Exchange filters (ie. recipient filtering, sender filtering, connection filtering). Therefore, I should start looking into the configurations of the filtering mechanisms that Exchange has?

Robin

 

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I found out where the problem lies. After checking out all of the exchange connection filters and finding nothing in the way of blocking Bob's domain, I decided to call the ISP. Due to peculiarities within the ISP's network, the issue was with them. Bob's domain and this domain are both using the same ISP and I would have to change some zone file settings (among other things). Easiest solution would be to move the handful of smtp accounts to use the pop3 connector.