Additional Sources of DKIM Information
For more information about DKIM, go to:
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Wikipedia: Domain Keys Identified Mail
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See also the DKIM specifications: RFC 6376 DomainKeys Identified Mail (DKIM) Signatures.
Tip:
Consider setting up a DMARC policy record for your company’s entire email infrastructure. See the subtopic Domain-based Message Authentication, Reporting and Conformance (DMARC) in Email Best Practices.