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SPF
(redirected from sun protection factor)

    Also found in: Dictionary/thesaurus, Medical, Acronyms, Wikipedia, Hutchinson 0.15 sec.

SPF

(1) (Stateful Packet Firewall) See stateful inspection.

(2) (Sender Policy Framework) An e-mail authentication system that verifies that the message came from an authorized mail server. SPF is designed to detect messages from spammers and phishers who falsify the sender's IP address in the e-mail header. SPF is an extension to the SMTP mail protocol.

SPF Records
The DNS system identifies the IP address of a receiving mail server with a line of text in the DNS database known as an MX record. DNS also supports a "reverse MX" record, which identifies the sending mail server and is used by SPF. When an e-mail message is received, the mail server checks the SPF record in the DNS to see if it matches the actual IP address of the message. If it does, the e-mail is considered valid. For more information, visit www.spf.pobox.com.

SPF Classic and PRA
There are two approaches to checking e-mail messages via SPF. SPF Classic systems check only the envelope header, while Microsoft's Purported Responsible Address (PRA) method looks at the headers within the message. See Sender ID, Joe Job, spam, phishing, throwaway domain and SMTP.



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? Mentioned in ? References in periodicals archive
 
Apply sun block: To keep kids safe while playing outdoors, apply waterproof sun block with a Sun Protection Factor (SPF) rating of 15 or greater to exposed skin at least every two hours.
Summer sports safety checklist by Parks & Recreation
Since the most protection that gives you is equivalent to a sun protection factor (SPF) of six, you'll need a 15 or 25 sunscreen anyway"
Dangerous tans by Allen, Kim / E
This is a significant finding, even though the protection isn't comparable to that of a sunscreen with a high sun protection factor [SPF]," says Judy D.
The skin game. (Special Feature) by Schardt, David / Nutrition Action Healthletter
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