maildirsmtp scans a maildir,
dir, and sends each message to
host through SMTP.
prefix from the beginning of each envelope recipient address.
It ignores any message whose recipient address does not begin with
maildirsmtp removes messages accepted by
host. It bounces messages permanently rejected by
host back to the envelope sender,
and then removes them.
It treats temporary rejection as permanent rejection
for messages more than two weeks old.
Note that failure to connect to
host is not temporary rejection.
host is never reachable,
maildirsmtp will never remove messages.
helohost as the local host name for saying hello to the SMTP server.