A DNS TXT record on your domain listing which servers are allowed to send email on its behalf. Receiving mail servers check it on every message; without it, they cannot verify your senders, which hurts deliverability and invites spoofing. Publishing SPF is a DNS edit, not a software project.
Also known as
Sender Policy Framework; v=spf1; SPF record
How Asteroad uses it. One of the two email-authentication checks in the Asteroad Quick Analyzer, chosen because it is verifiable from outside any site, even bot-protected ones. SPF alone is not enforcement; it needs DMARC on top to tell receivers what to do when a message fails.
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