For what it's worth, I get the same from time to time.
I've blamed my setup and/or OpenDKIM up until this point.And I will try to evaluate the recommendations from Gene as well as correlate my error messages with the headers given here.
//Anton On 10/30/22 23:37, David Rosenstrauch wrote:
I just got another 5 bounce messages to another one of my list emails. DR
