Rated 5 out of 5 stars

Excellent! I wish it would also check the SPF and DMARC parameters. Any chances the author would add this with an upcoming update?

Thanks so much for your contribution!

This review is for a previous version of the add-on (5.1.0). 

The add-on does not do any SPF or DMARC checks, but can read the result from the Authentication-Results header, see https://github.com/lieser/dkim_verifier/wiki/Options#read-authentication-results-header.

In the feature please use the issue tracker and discussions on GitHub for feature request and usage questions.