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Summary of Results
SPF check: pass
DomainKeys check: neutral
DKIM check: neutral
Sender-ID check: pass
SpamAssassin check: ham
Sender Policy Framework (SPF) - from their FAQ:
Sender Policy Framework (SPF) is an attempt to control forged e-mail. SPF is not directly about stopping spam – junk email. It is about giving domain owners a way to say which mail sources are legitimate for their domain and which ones aren't. While not all spam is forged, virtually all forgeries are spam. SPF is not anti-spam in the same way that flour is not food: it is part of the solution.
SenderId - a Microsoft technology which is very similar to SPF:
The Sender ID framework, developed jointly by Microsoft and industry partners, addresses a key part of the spam problem: the difficulty of verifying a sender's identity.
DomainKeys - from Wikipedia:
DomainKeys is an e-mail authentication system designed to verify the DNS domain of an e-mail sender and the message integrity.
DKIM - an evolved form of DomainKeys, from Wikipedia:
DKIM uses public-key cryptography to allow the sender to electronically sign legitimate emails in a way that can be verified by recipients. Prominent email service providers implementing DKIM (or its slightly different predecessor, DomainKeys) include Yahoo and Gmail. Any mail from these domains should carry a DKIM signature, and if the recipient knows this, they can discard mail that hasn't been signed, or that has an invalid signature.