- DKIM.org: Source: http://www.dkim.org/info/dkim-faq.html
- Wikipedia: http://en.wikipedia.org/wiki/DKIM
- Port25 Solutions, Inc.: Port25-Whitepaper-Authentication.pdf
- Sender Policy Framework: http://www.openspf.org/FAQ/How_does_it_work, http://www.openspf.org/SPF_vs_Sender_ID
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