[petecog]

I've given it a go.

I recommend also https://mxtoolbox.com/dmarc.aspx

I have no affiliation.

[petecog]

Great tool. Good comprehensive report. Keep up the great work. Hope it helps people.

Email is such an amazing mess. Love and hate in equal measures

[bks]

Seems that this tool actually validates your email and checks its alignment vs. just checking to see if there is a dmarc record on the domain.