Sendmail errors dsn=5.1.2, stat=Host unknown (Name server: x.x.x.x : host not found)

Solution Unverified - Updated -

Issue

  • Mails fail with the below errors:
[root@server ~]# tail -f /var/log/maillog
Oct 19 22:40:26 hostname sendmail[10411]: t9JMeQBH010409: to=<test@domain.com>, ctladdr=<root@hostname.com> (0/0), delay=00:00:00, xdelay=00:00:00, mailer=relay, pri=120536, relay=10.118.144.160, dsn=5.1.2, stat=Host unknown (Name server: 10.118.144.160: host not found)
Oct 19 22:40:26 hostname sendmail[10411]: t9JMeQBH010409: t9JMeQBH010411: DSN: Host unknown (Name server: 10.118.144.160: host not found)

Environment

  • Red Hat Enterprise Linux 6.x
    sendmail-8.14.x
    sendmail-cf-8.14.x

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