Here are some links to help. Basically here is an article how to set SPF & DKIM – THEN you have to put DMARC. It is something you do on all your domains and is the same. A couple videos tell you what DKIM is (I like how he emphasis the ‘D’ on DKIM – everytime) and other one is for all SPF,DKIM, DMARC AND he sets up his own server so you can get a feel for what is going on under hood.

So for me, I had to enable SPF and DKIM – now here is a straight forward approach for cPanel. Then add a DMARC record.

DMARC works atop of dkim and spf. for enabling dkim, we normally do this using a server command. We can also do this manually by following this guide, https://www.hostgator.com/help/article/using-dkim-with-third-party-dns under “Find and Copy Your DKIM-Signature” then simply add the record in cPanel > Zone editor > TXT

• DMARC Check: Use this link – note the format of the link: https://mxtoolbox.com/SuperTool.aspx?action=dmarc%3amydomain.com&run=toolpage
• At that link – you can also check the SPF and DKIM