Steve on 11 Jun, 2021 06:14 PM
welcome to the GPGTools support platform. Sorry you are having problems using GPG Suite.
We've seen this problem with various mailing group solutions like MS exchange, Google groups as well as Yahoo groups. Those services have the tendency to destroy valid email signature by slightly altering the structure of the message. We encourage users to bring up this problem with the corresponding developer so that they can improve their service to not render valid signatures invalid: Yahoo Groups help community, Google Groups Feedback, Mirosoft Support.
Please export the sent message as well as the received message, so that we can take a closer look. To export, select a message and press CMD + SHIFT + S, select "Raw Message Source" as type and save it. Then add both files to this discussion by visiting it in your browser (an email reply should work but sometimes attachments do not arrive).
We will then compare the messages and be able to understand in what way the message has been manipulated and potentially find a workaround.