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DKIM, SPF, DMARC - what is really needed?

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I have here a root server with Plesk. There are some domains with inboxes for family emails and some mini-projects (IPS). Does somebody know what is really needed for the mail server/domains to be sure that all mails are delivered and no misusage through spammer is possible at the same time?


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All of them.

Dmarc is essentially a way to tell mail providers that they can block any email from your domain that doesn't have a valid SPF or dkim. So that sits on top at the end and is a failsafe against your emails being spoofed.

SPF and dkim are also used by email providers and isp's for their internal spam checking. So, for the best chance of getting your emails delivered you need to use both.

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