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Glossary

SPF, DKIM, DMARC

The three email authentication standards required by major inbox providers.

Definition

SPF (Sender Policy Framework) lists the servers allowed to send on behalf of your domain. DKIM (DomainKeys Identified Mail) cryptographically signs each message so recipients can verify it wasn't tampered with. DMARC (Domain-based Message Authentication, Reporting and Conformance) tells receiving servers what to do when SPF or DKIM checks fail, and where to send aggregate reports.

Why it matters

Google and Microsoft enforce all three for bulk senders. Misconfigured authentication is the most common reason cold email lands in spam.

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