← DictionarySPF
also called sender policy framework
A DNS record listing which servers may send email for a domain.
A list of who is allowed to send email as you.
What It Is
SPF is a Technology item, filed under Email Tech. The working definition is simple: a DNS record listing which servers may send email for a domain.
It is a mechanism rather than an opinion: set up properly it behaves predictably, and set up badly it fails just as predictably. That definition is deliberately narrow — the narrowness is what makes it usable.
How It's Used
SPF comes up in build decisions, tooling and the plumbing behind a working system. It rarely travels alone — expect it next to DKIM, DMARC and TXT Record. The practical test is whether it is configured, documented and actually working.
Why It Matters
Getting SPF wrong is expensive in a quiet way. When it is unclear, small technical debts compound into a rebuild. The businesses that treat it seriously spend less time redoing work.
It is a piece of machinery doing one job in the background. A list of who is allowed to send email as you.
Termshift™
How the meaning shifts depending on who is using it, and where.
In agency and in-house rooms, SPF means exactly a DNS record listing which servers may send email for a domain.
In plain conversation it comes out as a list of who is allowed to send email as you.
The Bottom Line
SPF pays off when it is specific and costs you when it is not. A list of who is allowed to send email as you.