On 2022-11-02, at 20:51, Angel de Vicente wrote: > [...] > But here is a question. To send messages to this group I use another > e-mail address (which is not present in any of the certificates). There > is no way for me, then, to sign messages to this group with S-MIME?
There is. Before coming to that, please reconsider for what you ask: Alice sends a message to Bob, but the message is signed by Mallory. What is Bob supposed to do with this? IMO, the signature should really match the sender’s FROM address. Maybe you can ask your CA to include your other e-mail addresses as well? Or switch to GnuPG for your other e-mail addresses, where you are in control and not some CA (which Bob probably does neither know nor trust anyways)? See [1] for more information. Coming back to your question: You can customize mml-secure-smime-signers to include a list of IDs of signing keys. Best wishes Jens P.S. Google “protects” you from receiving my e-mails addressed to you directly as I spoof my FROM address here (SPF and DKIM both 550-5.7.26 do not pass). Thus, I remove your e-mail address in this reply. P.P.S. If you do not need direct replies, Gnus (Message, in fact) can set a Mail-Followup-To header [2]. [1] https://blogs.fsfe.org/jens.lechtenboerger/2013/12/23/openpgp-and-smime/ [2] https://www.gnu.org/software/emacs/manual/html_mono/message.html#Composing-a-correct-MFT-header-automagically
