Receiving Emails Even with Sync Interval Set to 'Manual'?

When I am not traveling, I set my Yahoo email sync interval to 'manual' and 'Use push if supported' to 'off'. (I prefer one of my PBs for email.). Still I get SOME emails coming to my ZED. Is this a cockpit problem, Yahoo's, or are some senders just really resourceful? Doc Neutron

I had done a similar thing and found that emails still came through but only when I lost signal and then regained it. Upon regaining signal, it was almost as though a refresh had occurred.