Postfix throwing error "Gmail has detected an unusual rate of unsolicited mail"

Solution Verified - Updated -

Issue

  • Below error is seen in /var/log/maillog
Gmail has detected an unusual rate of unsolicited mail. To protect 421-4.7.28 our users from spam, mail has been temporarily rate limited. Please 421-4.7.28 visit 421-4.7.28  https://support.google.com/mail/?p=UnsolicitedRateLimitError to 421 4.7.28 review our Bulk Email Senders Guidelines. y8-20020a17090aa40800b0027d74e8a50bsi300418pjp.69 - gsmtp (in reply to end of DATA command))

Environment

  • Red Hat Enterprise Linux
  • postfix
  • High volume mailing

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