[plug] Thunderbird Delete Mail off POP3 server via filter

[Tim White]

I am using Thunderbird 0.5 under Linux. (Deb package, side note, what 
apt source can I had so that I can get the latest firefox and 
thunderbird in deb package?)
I have the account settings for my Optus POP3 account to leave the mail 
on the server. I have a few filters that are supposed to delete the mail 
of the server if they match the filter and move them to a different 
folder. It moves the mail to a different folder but doesn't delete them 
off the server.
I set up a test filter and set some mail to myself that should have been 
deleted off the server and it doesn't work.
Has anyone experianced this and know a fix?
Tim