Go library and tools for DKIM, DMARC and Authentication-Results (program)

 Tools included in go-msgauth:
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  * dkim-keygen: generate a DKIM key
  * dkim-milter: a mail filter to sign and verify DKIM signatures
  * dkim-verify: verify a DKIM-signed email
  * dmarc-lookup: lookup the DMARC policy of a domain