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Re:SPF, DMARC, and DKIM: How to Keep Your Email Out of the S... by zimbatm on Tuesday June 21, 2016 @01:33PM (#11947580)
https://dmarcian.com/ is a really nice service. Their support was also very helpful while trying to figure out the same things you did.

Since there is a 10 query limit on SPF, if you delegate your SPF to third-parties like Google then your SPF might blow up unexpectedly if they increase the number of records on their side. Dmarcian monitors that for example.

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