MB wrote: >These results also mean that most likely my earlier postulated theory >is true. Which was: >that all filter conditions only apply to messages that are incoming from >the current connection or that have been selected with the filters >performed from the Mail menu and not for messages that have been fetched >already. > And how do you explain the fact, that you can choose the condition for a (non-manually started filter!): "Date is older than X days"?
This filter-condition doesn't make sense at all!

