Postbox has a nice feature where you can combine search terms merely by clicking on more than one tag or folder at a time (by command-clicking). Thus by clicking on “Reply” and “Work” under Tags in the left sidebar, I could see all work emails that require a reply. Or by clicking on “Invitations” under Tags and “Sent” under Favorites, I could see all invitations I had replied to. Effectively this is like the Boolean command AND. To replicate an OR search (show me all items that are either replies or about work), perhaps you could, say, option-click on a second term. Anyway this would be tremendously useful.
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