Mail Problems - Postfix - Network is unreachable error in RHEL

Solution Verified - Updated -

Issue

  • Receive message in logs: network unreachable 
Jun 14 20:07:10 <SERVER> postfix/smtp[3985]: connect to smtp.<MAILSERVER>.com[2001:4860:8005::1b]:25: Network is unreachable
Jun 14 20:07:10 <SERVER> postfix/smtp[3985]: E343B1A0BC5: to=<<EMAILNAME>>, relay=<MAILSERVER>-smtp.<MAILSERVER>.com[<IPADDRESS>]:25, delay=2, delays=0.14/0.02/1.2/0.7, dsn=2.0.0, status=sent (250 2.0.0 OK 1339726230 tj6si2577130pbc.288)
Jun 14 20:07:10 <SERVER> postfix/qmgr[3831]: E343B1A0BC5: removed

and

554 - host refused to talk to me

Jun 15 22:19:10 <SERVER> postfix/smtp[9230]: 7FADF1A0BCE: host <MAILSERVER>[<IPADDRESS>] refused
to talk to me: 554-<MAILSERVER> **554** Your connection from <IPADDRESS> has been rejected due to poor reputation.

Environment

  • Red Hat Enterprise Linux (RHEL)
  • postfix

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