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I'm having this problem as well. Since updating to OF 1.7.5, OF Mail Rule does not functions unless Mail.app message is selected and rule is manually invoked via Message > Apply Rules.

Properly formatted email is sent and received in Mail.app Inbox, but OF Mail Rule fails to trigger. This issue may have been present in previous OF 1.7.x versions—I don't recall testing the Mail Rule in recent versions—but the feature was working properly in 1.7.

Disabling Mail Rule in OF; removing OF Mail Rule in Mail.app; uninstalling MailTags 2.3.1 and Mail Act-On 2.0.5; then re-enabling Mail Rule in OF fail to resolve issue.

OF 1.7.5
OS X 10.5.8, PPC

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