better rules screen
The rules window needs to be improved to make it more understandable. As you can see in the attached screenshot the mailbox selection should go above the if statement.
That would make more sense since right now it looks like "any" single rule can activate the action which would mean "any mail in my inboxes" not just the ones that are true for the lines following the account selection line. In practice the way it works now is the rule checks the account/s I've chosen and then goes through the if/then on each of those rules. I've included a screenshot of how I think the rules should look
Dave Bell commented
There's a lot of ways the rules could be improved.