Hi,
we’re running latest stable build of kumomta version kumod 2024.09.02-c5476b89 and have sometimes issues with dkim signatures.
today we sent a bigger mailing to gmail.com and other german MX providers and get a notification of an invalid signature. for testing purpose I have a link for you: https://aboutmy.email/279abcfe/dkim
could you please investigate why we have an invalid dkim signature?