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Glossary

SPF

Sender Policy Framework: the DNS record that lists the servers allowed to send email for a domain.

SPF (Sender Policy Framework) is a TXT record published at the root of a domain. It lists the servers allowed to send email on its behalf, for example v=spf1 include:_spf.google.com ~all for Google Workspace. The server receiving an email checks that the sender is on this list. A domain must have only one SPF record, and it must not exceed ten DNS lookups.