DBMail over PostgreSQL + Postfix + SASL on Debian. Part 5. SPF. DKIM. DMARC. Clear headers. DNS PTR.
Part 1. Introduction.Part 2. DBMail.Part 3. Postfix.Part 4. SASL.Part 5. SPF. DKIM. DMARC. Clear headers. DNS PTR. SPF Sender Policy Framework is an email authentication method designed to detect forged sender addresses in emails (email spoofing). SPF allows the receiver to check that an email claiming to come from a specific domain comes from an …