Basic guide to set up DMARC on a WHM / cPanel server

DMARC is actually quite easy, because it’s just a TXT record.

There are a multitude of options, so best to choose some intelligent defaults to get you going.

Here is a good starting point:

_dmarc.example.com. IN TXT "v=DMARC1; p=quarantine; pct=100"

In essence, quarantine 100% of emails which do not pass SPF and DKIM.

If you’re using Virtualmin and you have set this as your default, you might also end up with something like this:

_dmarc.example.com. IN TXT "v=DMARC1; p=quarantine; pct=100; ruf=mailto:[email protected]; rua=mailto:[email protected]"

This can be slighly annoying, because your client might end up with emails from various systems that they do not understand. The point is DMARC systems co-ordinate their responses and when they feel something needs your attention they send you a summary. Furthermore special tools allows one to keep track of statistics.

Our advice: Start conservative, test, and take it from there.

https://mxtoolbox.com/emailhealth is a great testing tool.

Reference

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