I just added a DMARC validation tool over on

You can give it a domain – such as – and it will fetch the DMARC record, then explain and validate it. Or you can paste the DMARC record you’re planning to publish into it,  to validate it before you go live.

If you’ve not seen our tools page before, take a look. As well as DMARC we have a DKIM validator, SPF expander and optimizer, general DNS lookup tools, a bunch of RFCs covering all sorts of protocols, and base64 and quoted-printable decoders.

There’s also a widget that lets you add those little unicode pictures to your subject lines, whether you need a snowman ⛄, a forest 🌲🌳🌴🎄, or a pig getting closer 🐖🐷🐽.

The results pages all have easily copyable URLs so they’re pretty good for sharing with co-workers or customers if you need that sort of thing.

(And if you need a cidr calculator, whois, or easy access to & Microsoft SNDS check out Al’s


  1. Anthony says

    Nice addition, thanks Laura!

  2. Jon says

    Very nice, and very clean looking.

    And, dare I say it, no requirement to click on 7 store fronts and 8 street signs.

    Thank you Steve 🙂


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