Rated 5 out of 5 stars

Excellent add-on. Performs as advertised, starts working at once, and quite fascinating to review one's mail and see who has got their DKIM/DMARC config wrong. Including me, in the first instance.

Cheeky suggestion: If Philippe Lieser is looking for something to do in his copious free time, may I suggest he consider adding BIMI logo display to the add-on? At the moment I believe it displays logos of well-known senders from its own private collection of icons. To load the correct logo dynamically would be even cooler.

Léirmheas ar leagan níos sine den bhreiseán seo (4.1.1). 

Regarding BIMI and the potential problems and benefit of using it see https://github.com/lieser/dkim_verifier/issues/242#issuecomment-788283783.

For now you unfortunately have to create an issue/PR or write an email to add an icon missing in the internal list.