@dbeato so what should my next step be?

@dbeato i added a TXT record and in the txt record, i added the Suggested Name as the host=20211509._domainkey and then added the Suggested DNS record =v=DKIM1; k=rsa; p=MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAjddh3bmEvLbFI6cp60ZTEQJo4et80bPMhJ1OV5mVSOJl8w2hQL8EBzKISDNDxk9S6e7AiVTNNeYDu6mnxpacvlfsBEb5Pg1ZHqCiojf01XS4hbgvDLeHxsX2L11cYiYICQUQtVIzY0NHKZ2wN8bo2DkP+U10rb+KCTOeVi1jkeQHi+X5jp8NbiS/o4N0IFAzX7RP055oTvq8pBPtFI63IehSOsFndj3Cq6jBl0Oqb3R8lrKtih4tpK64HZwHTJWOR642MYVS4tiP5uAQTtaVQsnK81vW4lVGJDeLjiqLJI1B/m1mLatyJTM/FvlDCq1J2Y39Gv11uJz2Di0WsFH9xwIDAQAB as the value.

@dbeato .

@akpeelo Please can someone help out?

@dbeato do you mean perform nslookup on the selector? NB: if i use online tools such as https://dmarcian.com to check the record, it fails automatically. but if i enter the selector i used in the DKIM software on my server, it passes the check in the online tool.

I've installed exchange server 2016 CU21 and i've followed your post, but on the Domain Settings at the "Check" button when clicked says "No record found". ive updated my external dns with the suggested DNS Name and Suggested DNS Records respectively from the DKIM. What should i do next?