Fix guide

DKIM signature missing or failing

How to fix missing DKIM signing for the exact message path used in a placement test.

Needs attention

Why this matters

DKIM lets the receiving provider verify that the message was authorized by the sending domain and was not modified in transit.

A DNS record alone is not enough. The delivered message must actually include a passing DKIM signature for the sender or signing domain you expect.

How to fix it

Enable DKIM in your ESP, CRM, SMTP provider, or mailbox provider. Publish the selector TXT or CNAME record exactly as that provider gives it.

Send another test through the same system and confirm the delivered headers show dkim=pass before treating the issue as resolved.