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SPF — a DNS-based email authentication protocol that lets a domain authorize hosts to use it in the SMTP MAIL FROM or HELO identity.
SPF checks whether the sending IP is authorized to use the domain in SMTP MAIL FROM or HELO. It does not authenticate the visible From address or protect message content; DMARC also requires domain alignment.
SPF — a DNS-based email authentication protocol that lets a domain authorize hosts to use it in the SMTP MAIL FROM or HELO identity.
The receiver retrieves the domain’s SPF record, evaluates its mechanisms for the sending IP in order, and produces pass, fail, softfail, neutral, temperror, or permerror.
Publish one SPF record, authorize only real senders, stay within the ten DNS-mechanism lookup limit, and choose the correct all qualifier. Test both syntax and the actual sending IP after changes.
