[kde-linux] filtering in kmail (IMAP)

[Pollywog]

Is it possible to filter IMAP messages in kmail?  I know filtering works for 
pop3 but I don't believe it will work on IMAP mailboxes except perhaps if it 
is done manually.  I would like to have it done automatically when mail is 
received (when kmail is opened) and have the suspect spams either deleted or 
put in the SPAM folder.

I keep getting spams with certain words in the subject, frequently spams 
with "smallcap" or "small cap" in the subject and I have tried to get 
maildrop to read a list of spam subjects in a file and filter those emails 
but I have not succeeded.  Unfortunately some aspects of maildrop are not 
well-documented and I don't know how to do that, so I want to do it from 
kmail.  Spamassassin is not catching some of this trash.

The only way I know of to do this in maildrop is to have a rule in 
~/.mailfilter but I would need to have a rule for each spam subject and that 
is not efficient.

thanks