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This page last modified: Dec 08 2004

The problem is that email orginating on my machine is from
localhost.localdomain, and not (as it should be since
we'll assume for this document that my host is

Notice that the ctladdr and the from both say
localhost.localdomain. The mail bounces from the recipient's host.

Dec  8 09:32:34 example sendmail[4024]: iB6Jeqrn030992: to=<>, ctladdr=<mst3k@localhost.localdomain> (501/501)
, delay=1+18:51:42, xdelay=00:00:00, mailer=esmtp, pri=3900538, [], dsn=4.2.0, stat=Defer
red: 450 <mst3k@localhost.localdomain>: Sender address rejected: Domain not found

Dec  8 09:55:55 example sendmail[4083]: iB8EttLe004083: from=<mst3k@localhost.localdomain>, size=331, class=0, nrcpts=1, msgid=<
200412081455.iB8EttCd004080@localhost.localdomain>, proto=ESMTP, daemon=MTA, relay=localhost.localdomain []

The problem was that was in /etc/hosts incorrectly.

The wrong entry:       localhost.localdomain   localhost	example

The correct entries:       localhost.localdomain   localhost example