Exchange 2007: How to allow relay exceptions

17 07 2009

Although allowing unfettered relaying of e-mail through your Exchange 2007 server should be avoided, there are situations in which allowing relaying is desirable.

For example, suppose you have an HVAC system that reports to operations when a building’s air handling system strays outside preset parameters. These systems typically handle their reporting via e-mail and don’t authenticate with your SMTP server. The system simply needs your SMTP server in order to correctly route the message. In Exchange 2007, relay is made available through the use of a custom SMTP receive connector. I should note that, by default, Exchange 2007 does support relaying of mail for systems that authenticate. Today’s tip focuses on relaying from an unauthenticated system.

I don’t know about ‘desirable’ but relays are sometimes ‘inevitable’…

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