I had the same problem as Carlotta, using Win XP Pro and Outlook Express. After installing 4.5.529 it looks like the problem has disappeared. :slight_smile:

Uneducated guess on which settings could be involved (at least these are settings I’ve checked:
Outlook/Exchange - Inbound mail - Discard it unconditionally
Outlook/Exchange - Advanced - Silent mode
Outlook/Exchange - Heuristics - Silent mode