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Re: Signing a message with S/MIME in Gnus?

From: Angel de Vicente
Subject: Re: Signing a message with S/MIME in Gnus?
Date: Thu, 03 Nov 2022 07:21:04 +0000
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/28.2 (gnu/linux)


Jens Lechtenboerger <> writes:

> 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?

Yes, I realized after I sent the message that this was going to be
confusing. I managed to do it by setting
'mml-secure-smime-sign-with-sender' to nil, so that I could then choose
the certificate, but Gmail (for example) complains about the mail
address in the certificate not being the same as the "From" address, so
probably not a good idea in general.

> 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.

So, I was actually thinking of going for the second option: use SMIME
when I send from the address in the certificate, and use PGP when
sending from this gmail address. But now I need to figure out how to
tell Gnus to do that. Right now I have the following, which makes sure
that by default I will be always signing with SMIME. Do you know if
there is an easy way to set these depending on the "From" address?

| (add-hook 'gnus-message-setup-hook 'mml-secure-message-sign-smime)
| (setq mml-secure-method "smime")

Ángel de Vicente                 -- (GPG: 0x64D9FDAE7CD5E939)
 Research Software Engineer (Supercomputing and BigData)
 Instituto de Astrofísica de Canarias (

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