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

(2) (Sender Policy Framework) An email 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 email 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 email 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 email is considered valid. For more information, visit www.spf.pobox.com.

SPF Classic and PRA
There are two approaches to checking email 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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References in periodicals archive ?
While UVA levels in SA are not thought to exceed 7 UVAPFs a day, an SPF 30 product would have to have UVAPF of >7.5 to pass the ISO test.
From December on there will be no more sunscreens with incredibly high SPF claims of 80, 90 or even 100, because the FDA says there is no scientific indication that a higher value offers greater protection.
According to EUPOL COPPS' SPF adviser, results exceeded initial expectations, as the trainees showed technical capability and maturity despite their young age.
The spreadability component of the study compared a novel, lamellar/spherulite-like structured formulation (brand 1) to two marketed products (brand 2, brand 3) of comparable SPF level that used traditional emulsion droplet formulations.
Clinique has a collection of sun protecting face creams offering a choice of SPF 30 or 40 and costing pounds 13.21.
Rating: 2/5 Dermologica Sheer Moisture SPF 15, pounds 23.30 (0800 591818) I LOVED the shimmer effect of this moisturiser which gave my skin a gorgeous healthy glow.
The comparison was first made between MPB and control SPF in terms of veneer thickness and roughness, plywood and LVL gluebond quality and bending performance.
Burt's Bees Chemical Free Sunscreen, SPF 15 ($14, available at burtsbees.com)
The study recommends that consumers choose a sunscreen that offers protection against both UVA and UVB rays, is water-resistant and has a level of SPF 30 or higher.
to conduct research on SPF roofing systems in six different climate zones in the United States.
SPF 30 UVA protection: Moderate Water Resistant: Yes Verdict: Easy to rub on, so good for kids.