Not able to send emails via sendmail

Solution Verified - Updated -

Issue

  • Not able to send emails via sendmail. Getting below maillogs
May 29 11:40:54 host1 sendmail[34232]: v4TGesLx034232: to=user.name@domain.com, ctladdr=root (0/0), delay=00:00:00, xdelay=00:00:00, mailer=relay, pri=30220, relay=[127.0.0.1] [127.0.0.1], dsn=2.0.0, stat=Sent (v4TGesnd034233 Message accepted for delivery)
May 29 11:40:55 host1 sendmail[34235]: v4TGesnd034233: to=<user.name@domain.com>, ctladdr=<root@host1.domain.com> (0/0), delay=00:00:01, xdelay=00:00:01, mailer=relay, pri=120486, relay=relay_server1.domain.com [172.27.xxx.xx], dsn=5.7.1, stat=User unknown

Environment

  • Red Hat Enterprise Linux 6
  • sendmail

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