Ever heard of SPF, DKIM and DMARC for email - Let's understand them

Prashant Sharan

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Understanding SPF, DKIM and DMARC for email - A primer on email authentication.

Domain names are necessarily intertwined with email. The domain name connected with an email address is a signal for email services about the sender’s reputation, assisting the mailbox provider (MBP) and ISP when it determines what’s legitimate and what’s junk.

There are a few authentication mechanisms that domain owners can put in place to reduce the chances of phishers and spammers from spoofing their domains. In this post I’ll run through these at a high level; in later posts I’ll go more in-depth and explain how to set these up.


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