courier-maildrop 0.53.3-2ubuntu1 (i386 binary) in ubuntu feisty

 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.
 .
 maildrop will optionally read instructions from a file, which
 describes how to filter incoming mail. Instructions can be provided having
 mail delivered to alternate mailboxes, or forwarded somewhere else. maildrop
 uses a structured filtering language.
 .
 The installation of this package is recommended only for using it in
 conjunction with the sqwebmail package.
 Please use the standalone maildrop package otherwise.