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Have you tested with:

Another useful tool is https://www.learndmarc.com/ -- I found the presentation very helpful when I was finally getting on the DMARC train a while back.

True, MECSA is also interesting:

https://mecsa.jrc.ec.europa.eu/en/

They made me configure MTS

Whoa ! Very nice tool.

Ooh, thank you for sharing! This has given me a few things I should look into improving with my setup.

Thanks, I was missing a DKIM on my mailcow setup. 10/10 now :-)

Excellent!! Have a nice day!

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