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SPF
Security
A rule that says which servers are allowed to send email for a domain.
Definition
SPF helps mail servers check whether an email claiming to be from a domain is coming from an allowed sender.
In plain English
A rule that says which servers are allowed to send email for a domain.
Why this matters
Why it matters: It reduces spoofing, a common trick in phishing.
Example
Example: A domain publishes an SPF record so only its provider can send mail as that domain.