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Knowledge Base & Operational DocumentationHow to Troubleshoot Email Rejections Caused by a Missing DKIM Signature
11/10/2026
Mail may leave the server without a valid DKIM signature because signing is disabled, selector records are missing, or a relay changes the message.
Checks to make
Inspect message headers and signing logs, confirm the sending service uses the intended selector, and verify the public DNS key at the authoritative zone. Check whether forwarding or relaying alters signed content before changing DMARC policy.
When to get help
Email and DNS support can diagnose DKIM signing and record publication. Informatix Systems can assess the symptoms, evidence, and next steps. Contact Informatix Systems to discuss this issue.