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Implementing SPF, DKIM and DMARC in M365

· 6 min read
Matt Wyatt
Cyber Security Engineer

I recently decided to take a look at how SPF, DKIM and DMARC actually work under the hood, whilst I've always had a rough, wishy washy idea of what the purpose was I never fully understood the implementation or what the records meant.

So I learnt, and what better way to implement the theory than to implement these records in my developer instance?

This post will detail the implementation process in a M365/Exchange Online only environment and won't touch so much on the nitty gritty of what or how.