Re: Signing emails with mu4e (was Re: Hello, new committer here!)

[Efraim Flashner]

On Tue, Sep 01, 2020 at 01:29:52PM +0100, Pierre Langlois wrote:
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> 
> Pierre Langlois writes:
> 
> > Pierre Langlois writes:
> >
> >> Hello Guix,
> >>
> >> So, as indicated in our contributing process on the manual, I'm happy to
> >> announce maintainers have agreed to give me commit access, thank you
> >> everybody!
> >>
> >> I believe I need somebody to add my GPG keys to the Guix keyring before
> >> I can push my first commit. Which I think is going to be
> >> https://issues.guix.gnu.org/43138 (although, if this one is urgent,
> >> don't hesitate to push it for me!).
> >>
> >> If I'm not mistaken, since I'm using a subkey as a signing key, it
> >> should be this way (that's what I've had to do sign a personal channel):
> >>
> >>     (;; primary: "41CA 12EA DE0C F33F 6885  A58F 5719 6E37 E00B 77FD"
> >>      "72D5 3D81 8CB6 F4A1 7258  374C A8FC 9E44 7F4F 7D54"
> >>      (name "planglois")
> >
> > Huh, it looks like the email signature got messed up. I'm using mu4e but
> > it wasn't finding my key as it used to. I rolled-back to emacs 26 and
> > that seemed to have worked, except the email sent wasn't signed
> > properly.
> >
> > So, with this email, if I do `M-x mml-secure-message-sign-pgpmime' and
> > try and send, I get a backtrace:
> >
> > ```
> > Debugger entered--Lisp error: (error "Couldn’t find any signer names; try 
> > setting `mml-s...")
> >   signal(error ("Couldn’t find any signer names; try setting `mml-s..."))
> >   error("Couldn't find any signer names%s" "; try setting 
> > `mml-secure-smime-sign-with-sender'.")
> >   mml-secure-epg-sign(OpenPGP t)
> >   mml2015-epg-sign((part (sign . "pgpmime") (tag-location . 477) (contents 
> > . "Pierre Langlois writes:\n\n> Hello Guix,\n>\n> So, as ...")))
> >   mml2015-sign((part (sign . "pgpmime") (tag-location . 477) (contents . 
> > "Pierre Langlois writes:\n\n> Hello Guix,\n>\n> So, as ...")))
> >   mml-pgpmime-sign-buffer((part (sign . "pgpmime") (tag-location . 477) 
> > (contents . "Pierre Langlois writes:\n\n> Hello Guix,\n>\n> So, as ...")))
> >   mml-generate-mime-1((part (sign . "pgpmime") (tag-location . 477) 
> > (contents . "Pierre Langlois writes:\n\n> Hello Guix,\n>\n> So, as ...")))
> >   mml-generate-mime(nil nil)
> >   message-encode-message-body()
> >   message-send-mail(nil)
> >   message-send-via-mail(nil)
> >   message-send(nil)
> >   message-send-and-exit(nil)
> > ```
> >
> > I've tried setting `mml-secure-smime-sign-with-sender' to `t' that's not
> > helping.  I'm not sure what's going on, are there any mu4e users here
> > that can sign emails? I wonder if it's do to with the recent gnupg
> > update instead of emacs.
> 
> Right, it works with these variables set:
> 
>     (setq mml-secure-openpgp-signers '("KEYID"))
>     (setq mml-secure-opengpg-sign-with-sender t)
> 
> And using '<#secure method=gpg mode=sign>'
> 
> I'm not sure what's broken, this used to "just work" by default without
> having to tell emacs where to find the signer key. mmm
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> =lha/
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> 

Not sure what's up with the inline signing of the message. I had to pipe
the whole message from mutt into 'gpg --verify' for it to check the
signature.

-- 
Efraim Flashner   <efraim@flashner.co.il>   אפרים פלשנר
GPG key = A28B F40C 3E55 1372 662D  14F7 41AA E7DC CA3D 8351
Confidentiality cannot be guaranteed on emails sent or received unencrypted

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