On 2020-08-13 08:52, David Bremner writes: > I _think_ it's a change in message-mode. Does it work for you if you set > mml-secure-openpgp-sign-with-sender? > > (or smime, if using smime) I had changed smime, as it was suggested by the error message, so I now just set openpgp (as it's what I'm using). And I can report that it works. I don't know why I need this additional variable, but it's great news. Thanks a lot for the help! Best, Alan