dmarc

Interesting chart. I have implemented DMRC on my poor DS118 email service. I can’t understand why a huge company can’t (or won’t) do it! No. 2 on the chart is “have an MX record”! Can one run an email server (service) without an MX record?!

If you’re a brave soul who’s feeling adventurous and about to embark on setting up your own mail server on your DiskStation, this is a very helpful article that explains SPF, DKIM and DMARC.