If everything looks correct on the 365 server side, I would open a ticket with support if you arent seeing anything in the headers of the messages.
DKIM Enabled and DNS Record Published but no DKIM header on emails
Hi,
So I am using Office 365 as my email host along with GoDaddy as my domain host. I already setup the email and using it but all my emails keep going to spam due to lacking a DKIM header.
I already pass all SPF and DMARC checks. And for the DKIM, I added the CNAME tags including the suggested selectors by microsoft on Godaddy and activated the DKIM signing on Microsoft.
Online tools confirm that these tags are now public. Even the Microsoft DKIM self check tool says my DKIM is configured correctly. MXtoolbox says my DKIM record is found and valid and that the public key is present.
However until now all my outgoing emails are missing the dkim headers saying: dkim=none (message not signed).
DKIM signing is enabled on my custom domain since the second of October. I figured by now it should be working. Any idea what can be done next to fix this?
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Andy David - MVP 157.8K Reputation points MVP Volunteer Moderator
2022-10-06T18:36:56.333+00:00
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Andy David - MVP 157.8K Reputation points MVP Volunteer Moderator
2022-10-10T15:35:41.707+00:00 One thing you could try is to rotate the DKIM sigs and see if that pops it.
Since its not working anyway, it wont hurt:
https://learn.microsoft.com/en-us/microsoft-365/security/office-365-security/use-dkim-to-validate-outbound-email?view=o365-worldwide#steps-to-manually-upgrade-your-1024-bit-keys-to-2048-bit-dkim-encryption-keys