If you are asking “What is SPF?” or “What is DKIM?” or “What is DMARC”, or generally “What is email authentication” and “Why do I need it”, well, you are far from alone. There is a lot of confusion around email authentication, so here is a plain English, simple explanation of what each email authentication is, and what it does.

First, SPF stands for Sender Policy Framework, DKIM stands for DomainKeys Identified Mail, and DMARC stands for Domain-based Message Authentication, Reporting and Conformance. But, in the immortal words of the movie Airplane, that’s not important right now. What is important is that you understand how these things work.

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