Further to Len and Scott's comments: Ipswitch has acknowledged that, to ensure RFC 2821 compliance (it's still a draft, not yet a standard), they will be adding the Return-Path: header in a future release. Also, Scott didn't mention that Declude has a feature that lets you add an the header to mail coming in to local domains, if you need it right now. Don't try to write your own--you could break a lot of things.
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