Emails to a specific domain are all delivered locally

Solution Verified - Updated -

Issue

  • Mail is not being delivered through the relay host that is properly set up, instead it sends locally:

    Sep 30 16:13:36 hostname sendmail[8276]: t8UKDaQu008276: to=user@domain.com, ctladdr=root (0/0), delay=00:00:00, xdelay=00:00:00, mailer=relay, pri=30233, relay=[127.0.0.1] [127.0.0.1], dsn=5.1.1, stat=User      unknown
Sep 30 16:13:36 hostname sendmail[8277]: t8UKDaKv008277: from=<root@hostname.domain.com>, size=233, class=0, nrcpts=0, proto=ESMTP, daemon=MTA, relay=localhost [127.0.0.1]

Environment

  • Red Hat Enterprise Linux (RHEL) all versions
  • sendmail

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