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SMTP filter vs. downed Exchange Server

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SMTP filter vs. downed Exchange Server - 29.Jan.2007 12:41:58 PM   
BobW

 

Posts: 227
Joined: 27.Mar.2002
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I had an issue this weekend which I am trying to pin down. (Before reading this please note that I did not have the SMTP loggin turned on....).

We have a third party (off site) spam/virus filtering company which is our primary MX.  All incoming email goes through them.  When our SMTP goes down, they begin queuing email.

On ISA 2006 I have a forwarding rule to our internal exchange server.  The rule only accepts email from the third parties subnet thus the reason for publishing directly to our Exchange server.

This weekend our Exchange server went down.  Yet the third party kept sending email and did not start queueing.

After a bit more investigation I noticed I had the SMTP filter turned on for the SMTP publishing rule.

So, my question is:

Was the ISA server continuing to accept email because of the SMTP filter?  If so, where did the email go since the internal email server was down?

Thanks,
Bob

PS I have turned on the SMTP logging and will be disabling the SMTP filter since it only accepts SMTP traffic from a known source.
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