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Marketing emails - Rejected by header based Anti-Spoofing policy

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When sending test marketing emails to a colleague, the delivery fails with bounce category: multiplesoftbounces, and email bounce reason: smtp;550 Rejected by header based Anti-Spoofing policy: event@company.com.au - community.mimecast.com/.../DOC-1369 [2Jgldvk_P6yuevZARv890w.au74]

The address in the bounce message event@company.com.au is not a valid email address at our company, and it is not the marketing email sender. This email address doesn't appear in the Mimecast Anti-Spoofing policies either. Could this email address be somewhere in Dynamics?

I opened a ticket with Mimecast 14 days ago, but we have been unable to resolve this so far.

There is no record of the email being rejected within Mimecast, and Mimecast support suggest it never reached Mimecast.

Other staff can receive the test marketing emails without issue, suggesting Mimecast Anti-Spoofing policies are allowing the emails through.

Troubleshooting already complete (we are crm6):

Mimecast anti-spoof policies added for email sender address already exists
Mimecast anti-spoof policies added for the non-valid event@company.com.au address
Mimecast anti-spoof policies added for the IP address of Dynamics365ForMarketingEmail.AustraliaSoutheast (13.77.51.0/24) from https://docs.microsoft.com/en-gb/power-platform/admin/online-requirements#ip-addresses-and-urls

I have already trawled the forums, but still unable to find a resolution.

Can we trace the email from Dynamics?

Any suggestions?

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Community Member on at

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Further info, we believe the rejections are a false-positive, and from a previous marketing email. Dynamics is not attempting to send the new marketing emails - just giving the cached anti-spoof message.

Testing:

Error message is the same for all rejections to this person	Changing sender address does not change the error, and the email ID does not change ([2Jgldvk_P6yuevZARv890w.au74])
Created new email alias for recipient	Email was received successfully

How do I clear the cache to allow emails for this recipient?

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Aga M on at

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Hi Gail_MK,

Thank you for the question.
Here please find our documentation on how to handle this and other cases: https://docs.microsoft.com/en-us/dynamics365/marketing/email-troubleshooting

Best Regards,
Aga

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Community Member on at

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Thanks Aga,

We already have Mimecast policies setup, and emails work successfully for all staff, except one. This staff member can receive emails using an alias email address.

The error suggests that the email is not attempting to send, and Mimecast confirm the email is not hitting their system. The error message is false and persists from a previous failure.

Is there a way to clear this error / recipient address?

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Verified answer

Andy Onofrei on at

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HI Gail,

I believe this specific recipient email address was added to our global suppression list.

I will need the email address in order to remove it.

You can reach out directly to me at andrei.onofrei@microsoft.com .

Andy Onofrei

Senior Email Deliverability Engineer

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Community Member on at

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Thanks Andy! I have emailed you.

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