default filters for mailbox
It would be very usefull if it is possible to add some default filters on a mailbox, or at least add the option to filter on headers, like filtering spam based on the X-SPAM-FLAG header.
At the moment it's only possible to filter on To: From: and Subject: and I think that for many (especially end-users) it's difficult to define these filters by hand, so it would be good to have an "easy" clickable option to filter at least spam to a specific folder.