Do you know what your DMARC policy is, or if you even have a DMARC record? Of the authentication mechanisms (DMARC, SPF, DKIM) SPF and DKIM are important resources to authenticate different aspects of your email flow, but it’s important to have a DMARC record stating your DMARC policy as well. This is because your DMARC policy (contained in your DMARC record which is a text record within your DNS records) tells email receivers what they should do with email that claims to be from you but that fails SPF and/or DKIM.

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