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Error: 550-5.7.26 unauthenticated email from domain.com is not accepted...

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Article ID: 216098

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Updated On:

Products

Messaging Gateway

Issue/Introduction

When attempting to deliver mail to Gmail or a Google hosted mail server, the message is rejected with the following response:

550-5.7.26 unauthenticated email from domain.com is not accepted due to domain's
550-5.7.26 dmarc policy. please contact the administrator of domain.com domain
550-5.7.26 if this was a legitimate mail. please visit
550-5.7.26  https://support.google.com/mail/answer/2451690 to learn about the
550 5.7.26 dmarc initiative. - gsmtp

Environment

Release : 10.7.4

Component : DMARC

Cause

Message delivery is failing DMARC authentication 

Resolution

  • Confirm that Messaging Gateway is configured to sign outbound messages using DKIM
    • Protocols > Domains > domain > Delivery > DomainKeys Identified Mail
  • Confirm that that DKIM records are published to the DNS and are correct
  • Confirm that SPF records are published to the DNS are and correct