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dmarc
This is an old revision of the document!
https://www.dnswl.org
https://dkimvalidator.com/
http://multirbl.valli.org
https://dmarc.org/resources/deployment-tools/
https://toolbox.googleapps.com/apps/checkmx
https://postmaster.google.com/u/0/managedomains
autoreply@dmarctest.org
check-auth@verifier.port25.com
mailtest@unlocktheinbox.com