DKIM IN Exchange

Question

Hi
I set up an exchange server and now my problem is that the dkim I defined is correct and I got a score of 10/10 in the email test, but when sending an email to Gmail or Outlook, the emails sent are sent to spam if When I look at the source of the message, both in Gmail and in outlook, dkim is shown as a pass.
Thanks for guiding me.

Answer 1

Hi Navid,
have you already setup public TXT records for SPF and/or DMARC?
If yes, please search for the message header "Authentication-Results" and check, if SPF, DKIM and DMARC passes.

The DKIM Test you describe may just verify, if the DKIM signature in the message header for the domain your server is signing for is valid.
It does not necessarily mean that the signing domain is the same of the sender: / from: header domain.
By the way, which test did you utilize?

Regards, Alex

Answer 2

Hello dear Alex
I am from https://www.mail-tester.com/
I used it for testing and got a score of 10/10. I also used Exchange dkim signer software to create a dkim record.
And inside the message source in Gmail, dkim is considered passed. But it puts the message in the spam.
It should be noted that my internal domain name is different from my external domain name, and I used a policy in Exchange to specify that all emails be sent under my external domain name.
Thank you very much Navid

Answer 3

Hi @navid Talesh

What's your Exchange server version?

I agree with the reply above from alex, have you configured the SPF and DMARC record for your organization as well?

Refer to the official document to leaarn about how SPF record works here: How Microsoft 365 uses Sender Policy Framework (SPF) to prevent spoofing

In addition, we could also use the MXTOOLBOX to check the records configured for your domain: https://mxtoolbox.com/

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