Help on setting up DMARC compliance across many DNS providers can be found https://help.moosend.com/hc/en-us/sections/4407570203538-Deliverability
Moosend article on DKIM: https://help.moosend.com/hc/en-us/articles/4409209163282
Moosend article on SPF: https://help.moosend.com/hc/en-us/articles/4409220716050