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I spent a little while today playing with Mail to try to get this feature to work.

In my case it turns out that I have "blahblah@mac.com" as one of my email addresses, but my MobileMe account now sends messages from "blahblah@me.com".

Fix that up by either changing your email address in your "My Card" in Address Book, or adding the "blahblah@me.com" address into OmniFocus' "Allowed From addresses" field.

Hope this helps someone.