Alan Freedman -- The Computer Language Company - Computer Desktop Encyclopedia
Computer Desktop Encyclopedia
Longest-Running Tech Reference on the Planet

A CDE Definition

You'll love The Computer Desktop Encyclopedia (CDE) for Tech Term of the Day (TTOD)

LOOK UP ANOTHER TERM


SPF

(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.



Personal Use Only

Before/After Your Search Term
BeforeAfter
SPEEDESPFM
speedifSPFX
speedif portSPGA
Speedospherization
SpeedwareSPI
SpeedySPI bus
spell checkSPI firewall
spell checkerSPI router
spellcheckSPICE
SperrySPID

Terms By Topic
Click any of the following categories for a list of fundamental terms.
Computer Words You Gotta KnowSystem design
Job categoriesUnix/Linux
Interesting stuffPersonal computers
InternetIndustrial Automation/Process Control
Communications & networkingAssociations/Standards organizations
HistoryDesktop publishing
Audio/VideoGraphics
MainframesSecurity
ProgrammingHealthcare IT
System design