Sending mail via Sendmail gives error in maillog "Name server: mail.example.com: host name lookup failure"

Solution Verified - Updated -

Issue

  • Trying to send email gives error:
Jun 20 16:28:21 i5981dlg11 sendmail[23064]: q5KJV9nd010876: to=<blongo@example.com>, ctladdr=<root@i5981dlg11.inside.example.com> (0/0), delay=00:57:12, xdelay=00:00:00, mailer=relay, pri=210350, relay=mail.example.com, dsn=4.0.0, stat=Deferred: Name server: mail.example.com: host name lookup failure
  • Here mail.example.com is configured as smart host.

Environment

  • Red Hat Enterprise Linux 5
  • Red Hat Enterprise Linux 6

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