SPF, DKIM, DMARC and Exchange Online

We don’t like spam. And we need help fighting it, so this is what this post is about: Helping you help all of us that fight spam every day.

Let’s start with the concepts. I promise it’ll be quick:

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The information stating who can send e-mails is stored on a TXT record in the DNS zone.



No digital certificate is required. Public key is published using DNS TXT records.



The DMARC policy is published via DNS TXT record.