[CentOS] Thunderbird not automatically filter on incomming mail

Hi folks,

I've noticed since long time ago that all the filters i have preset in thunderbird on CentOs are not automatically being applied as mail arrives. What i use to do is going to Tools->Run Filters on Folders being reading the "Local Folders -> Inbox" folder.

Is there a way to preset it to automatically filter the incomming mail to the corresponding folders? I can remember some time ago it was working ok, but since a mail-store translation from a different machine to this one im having this issue for some accounts/filters only.

$ rpm -q thunderbird thunderbird-1.0.8-1.4.1.centos4

TIA

Jose.