Action from mail not working when mail sent from outlook
 

I have set up a mail rule to automatically create actions in my inbox from mails that are sent to a gmail account that I retrieve using Mail.app.

This works just fine when I send an email from my gmail account to my gmail account. The mail appears in Mail.app, the rule runs and a new action is created in my inbox.

But for some reason, if I send an email from outlook to my gmail account, the rule does not trigger. The mail appears in Mail.app but the rule does not trigger. The To looks just fine and should trigger the Mail.app rule which is looking for recipients with +omnifocus in them.
Here is an example:
From: [email]name@example.com[/email]
Subject:
Date: July 15, 2008 1:32:29 PM GMT+00:00
To: name+omnifocus@gmail.com

Does anybody have any idea why this might be the case?

Is the sending account (in this case, the From account in your Outlook mail) one of the "Allowed From addresses"?