efa-project.org

I dont know dmarc differences from spf
dmark tell to quarantine, none or reject unauthorized servers, but also spf can do this
it adds dkim to chek, but it can be done by a ruule also without dmark

https://www.endpoint.com/blog/2014/04/1 ... xplanation

https://www.smartertools.com/blog/2019/ ... dkim-dmarc