SPF (Sender Policy Framework)
SPF (Sender Policy Framework) is a DNS TXT record that lists which mail servers are allowed to send email on behalf of your domain.
Receiving servers check SPF to detect spoofing: if mail arrives from a server not in your SPF record, it can be rejected or marked as spam. A correct SPF record is one of the three pillars of email authentication, alongside DKIM and DMARC.
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Related terms
DKIM (DomainKeys Identified Mail)DKIM (DomainKeys Identified Mail) adds a cryptographic signature to outgoing email so receivers can verify it really came from your domain and was not altered.DMARCDMARC is a DNS policy that tells receiving servers what to do with email that fails SPF and DKIM checks, and where to send reports about it.MX RecordAn MX (Mail Exchange) record is a DNS record that tells the internet which mail servers are responsible for receiving email for a domain.
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