maildircmd - pipe a maildir through a command

maildircmd dir prefix command

maildircmd scans a maildir, dir, and pipes each message through command. It ignores any message whose recipient address does not begin with prefix.

maildircmd removes messages successfully handled by command, based on the exit status of command. It bounces messages permanently rejected by command back to the envelope sender, and then removes them. It treats temporary rejection as permanent rejection for messages more than two weeks old.

maildirserial(1), serialcmd(1),