Question:

There is an error in the Event_Msg_vod field of an Email_Activity_vod of Sent Email:

|code:550|reason:hardfail|description:5.7.26 Unauthenticated email from xxx.com is not accepted due to domain's
5.7.26 DMARC policy. Please contact the administrator of xxx.com domain
5.7.26 if this was a legitimate mail. Please visit
5.7.26 https://support.google.com/mail/answer/2451690 to learn about the
5.7.26 DMARC initiative.

What does the code:550 mean?

Answer:

This error is a standard response for failing DMARC. The error is a response from the recipient domain.
 
The mail server for the domain is rejecting the email due to the sender's DMARC policy. The security-centric goal of DMARC is to ensure that the domain in the From address reflects the same domain that is sending the email. As more email service providers adopt DMARC, messages that have a domain in the From address that differ from the sending domain will be quarantined, marked as spam, or rejected completely depending on the policy set by the administrator.
 
This can happen when the domain in the From address does not match the 'envelope domain' - the sending domain the email headers were stamped with. This is a common problem with group lists and distribution lists. Current email best practices are clear that the domain of the From address and sending domain should match. The link provided by Google is helpful for more information.

Related Documentation:

CRM Help Documentation: N/A