Helo command rejected: Host not found (in reply to RCPT TO command))

Solution Verified - Updated -

Issue

  • Maillog
postfix/smtp[18902]: 447099A32B: to=<user@example.com>, relay=mx6.stmpserver.com[x.x.x.x.]:25, delay=0.83, delays=0.04/0/0.57/0.21, dsn=4.7.1, status=deferred (host mx6.stmpserver.com[x.x.x.x.]  said: 450 4.7.1 <server.hostname.com>: Helo command rejected: Host not found (in reply to RCPT TO command))

Environment

  • Red Hat Enterprise Linux
  • Postfix

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