maildrop 1.5.3-2 (powerpc binary) in ubuntu dapper

mail delivery agent with filtering abilities
 maildrop is a replacement for your local mail delivery agent.
 maildrop reads a mail message from standard input, then delivers the
 message to your mailbox. maildrop knows how to deliver mail to mbox-style
 mailboxes, and maildirs (a mail storing format introduced by Qmail).
 .
 maildrop can optionally read instructions from a file on how to filter
 incoming mail, and, based upon the instructions, deliver mail to alternate
 mailboxes, or forward it to somewhere else, like procmail. Unlike procmail,
 maildrop uses a structured filtering language that's a bit easier on the
 eyes.