I am looking for an anti-spam utility which supports the following:Greylisting
IMAP Filtration of messages
Rule based filtering
Whitelist/blacklist (based on address book entries)
The REQUIRED features are Rule based, white/blacklisting and IMAP filtration (t-bird). Greylisting would be nice, but I dont know of a client-side solution which supports this.
Can anyone recommend any solutions?