[Users] List server: bad DKIM?

[Removed GDPR]

> - In the case of invalid.tld, is Google inserting signatures in the
>   correct order?:
>     DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;
> d=invalid.tld; s=google;
>      v=1; a=rsa-sha256; c=relaxed/relaxed;

As per https://www.ietf.org/rfc/rfc6376.txt:

"  Existing standards allow intermediate MTAs to reorder header fields.
   If a Signer signs two or more header fields of the same name, this
   can cause spurious verification errors on otherwise legitimate
   messages.  In particular, Signers that sign any existing DKIM-
   Signature fields run the risk of having messages incorrectly fail to
   verify."

But all that is indeed quite off-topic to claws mail itself.