postfix will not relay emails, Error: "smtpd_recipient_restrictions, specify at least one working instance of <values>"

Solution Verified - Updated -

Issue

  • postfix will not relay emails, getting below error in /var/log/maillog:
Sep 12 11:09:22 SERVER1 postfix/smtpd[74890]: fatal: in parameter smtpd_relay_restrictions or smtpd_recipient_restrictions, specify at least one working instance of: reject_unauth_destination, defer_unauth_destination, reject, defer, defer_if_permit or check_relay_domains
  • After Upgrade to RHEL8 Postfix is failing with above error message

Environment

  • Red Hat Enterprise Linux 8
  • Red Hat Enterprise Linux 9
  • postfix
  • RHEL Upgrade

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