Binary package “mailfilter” in ubuntu intrepid

A program that filters your incoming e-mail to help remove spam

 Mailfilter is very flexible utility for UNIX (-like) operating systems to get
 rid of unwanted e-mail messages, before having to go through the trouble of
 downloading them to the local computer. It offers support for one or many
 POP3 accounts and is especially useful for dialup connections via modem,
 ISDN, etc. Install Mailfilter if you'd like to remove spam from your POP3 mail
 accounts.
 .
 With Mailfilter you can define your own filters (rules) to determine
 which e-mails should be delivered and which are considered waste. Rules
 are Regular Expressions, so you can make use of familiar options from
 other mail delivery programs such as e.g. procmail.
 .
 If you do not get your mail from a POP3-Server you don't need Mailfilter.