DevinG at 3sharp
Feb 28, 2008, 12:59 PM
Post #1 of 1
Stuart D. Gathman wrote:
RE: [spf-discuss] How to modify the MAIL FROM argument? (was: Re: Top problems with SPF acceptance)
> On Thu, 28 Feb 2008, Alessandro Vesely wrote:
> > I never used any of those. Can anyone briefly mention the
> > filtering capabilities of any of them?
> Microsoft Exchange has Event Sinks that work similarly to the
> milter API (a separate process that responds to events and
> modifies exchange behaviour), but only in Windows, of course.
Note that events sinks are discontinued in Exchange Server 2007 and have been replaced by the Transport Agent API, which is a .NET API that (in theory) gives you all necessary functionality. Poking around the SDK, you can easily get access to the From header of the message itself, and Exchange fires an event after the MAIL command (SmtpReceiveAgent.OnMailCommand) that you can handle. However, it's not clear whether you actually have access to change the values in the SMTP session. I've got a query in to find out whether this access is read-only or not.
Devin L. Ganger, Exchange MVP Email: deving [at] 3sharp
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