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Verifying

Stalwart SMTP supports verifying the DKIM signatures of incoming messages using the ED25519-SHA256 (Edwards-Curve Digital Signature Algorithm), RSA-SHA256 or RSA-SHA1 algorithms. The auth.dkim.verify attribute indicates the DKIM verification policy:

  • relaxed: Verify DKIM and report the results in the Authentication-Results header.
  • strict: Reject the message if all DKIM signatures fail verification, otherwise report the results in the Authentication-Results header.
  • disable: Do not perform DKIM verification.

Example:

[auth.dkim]
verify = "relaxed"