Getting message "host map: lookup (domain.com): deferred" in mailq.

Solution Unverified - Updated -

Issue

  • Mails are not working on the system and getting following message in mail queue:
t65Fxxxx6966     9124 Sun Jul  5 11:06 MAILER-DAEMON
                 (host map: lookup (domain.com): deferred)
                     <user@domain.com>

Environment

  • Red Hat Enterprise Linux 6
  • Sendmail
  • NetworkManager

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