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

[lists at lazygranch.com]

On Sun, 18 Feb 2018 02:30:00 +0200
Removed GDPR <removed-gdpr at example.com> wrote:

> My DKIM is set correctly. I don't know why it should be treated
> as "bad". Everyone has been receiving my emails correctly for years.
> 
> --
> George
> _______________________________________________
> Users mailing list

Here is what I have for your header (sanitized). Try 
http://dkimvalidator.com/

Received-SPF: Pass (sender SPF authorized) identity=mailfrom;
client-ip=212.83.157.151; helo=mx.colino.net;
envelope-from=users-bounces at lists.claws-mail.org;
receiver=lists at example.com DMARC-Filter: OpenDMARC Filter v1.3.2
www.example.com F1A2769BE9 Authentication-Results:
centos-1gb-sfo1-01; dmarc=fail (p=quarantine dis=none)
header.from=invalid.tld Authentication-Results: centos-1gb-sfo1-01;
spf=pass smtp.mailfrom=users-bounces at lists.claws-mail.org DKIM-Filter:
OpenDKIM Filter v2.11.0 www.example.com F1A2769BE9
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])