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Did you have the Mail app open at the time your friend's email hit the server? And are you positive that you only received one email from this friend? Did your email to OmniFocus make it into the database? How many of these showed up in the log?

OmniFocus calling process_message in MailAction script

Certainly possible there's some race condition or other bug in Mail that results in the wrong information being handed off now and then, but I've run many hundreds of messages through this feature without encountering it. Makes me rather curious!