Problem with my DNS

I want to run an email marketing campaign using the easymailing tool and my email associated to my domain. To be able to do this easymailing asks me to add DNS to authenticate it, however I add them and it does not work. Does anyone know what it could be or what I can do?

I have problems in the SPF, this is the value that tells me that I have to put: v=spf1 ~all and this is what it tells me next: The ‘ptr’ mechanism shouldn't be used because it's slow, resource intensive, and not very reliable

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