maildrop 2.0.3-1 (i386 binary) in ubuntu hardy

 maildrop is a mail delivery agent (MDA), a program which reads a mail
 message from standard input and then delivers the message to your mailbox.
 .
 maildrop knows how to deliver mail both in mbox and maildir storing
 formats. It can read instructions from a file, directing it how to filter
 incoming mail, for example to deliver mail to alternate mailboxes,
 or forward it to somewhere else.
 .
 It performs all the same functions as procmail, but unlike procmail,
 maildrop uses a structured filtering language which is a bit easier
 on the eyes. Other differences from procmail include not skipping syntax
 errors in filter files (instead deferring the mails for later processing)
 and being more resource-efficient when processing mails (not loading
 large messages right into memory).