[Users] DKIM Signature issues [Was: List server: bad DKIM?]

[Removed GDPR]

> Authentication-Results: www.example.com; dkim=fail reason="signature
> verification failed" (2048-bit key) header.d=invalid.tld
> header.i=@invalid.tld header.b="jMs72D5j" Received: from mx.colino.net
> (srv.colino.net [212.83.157.151])
>

I don't know why signature verification is failing when you test. Here
is my test:

https://www.mail-tester.com/web-g4gw0