Learn and Test DMARC site
Note
fighting email server setup and maintenance is not fun.
using this interactive DMARC tester is.
interactive analysis is a great way to not only find out what is wrong but learn a bit along the way.
Summary
an interactive DMARC and SPF tester. you send them an email and the website walks you through the reception and analysis of the headers, teaching you about DKIM verification, SPF validation and more. all done in a neo matrix terminal style.
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