emacs: removed unneeded mail variables and fixed setup for 27

There were two variables that were long removed from GNU Emacs (since 24.x, I
think). I was setting them anyways and the byte compiler was complaining about
it. I used to ignore this warning, but now I want to play nice.

Moreover, since upgrading to GNU Emacs 27.x I've noticed that sending emails was
broken: it was not able to figure out the GPG key from which to sign
emails. I've fixed this by directly telling `mml' which key to use.

Signed-off-by: Miquel Sabaté Solà <msabate@suse.com>

1 files changed, 8 insertions, 4 deletions

diff --git a/.emacs.d/init.org b/.emacs.d/init.org
index 66048a7..89e5d68 100644
--- a/.emacs.d/init.org
+++ b/.emacs.d/init.org
@@ -1301,9 +1301,7 @@ the configuration.
 
   (require 'smtpmail)
 
-  (setq smtpmail-starttls-credentials '((server port nil nil))
-        smtpmail-auth-credentials (expand-file-name "~/.authinfo.gpg")
-        smtpmail-default-smtp-server server
+  (setq smtpmail-default-smtp-server server
         smtpmail-smtp-server server
         message-send-mail-function 'smtpmail-send-it
         smtpmail-smtp-service port))
@@ -1454,7 +1452,13 @@ Setting my bookmarks
 Sign outgoing emails always.
 
 #+BEGIN_SRC elisp
-  (add-hook 'message-send-hook 'mml-secure-message-sign-pgpmime)
+;; For some reason, as of GNU Emacs 27.x, I need to define the default openpgp
+;; signer so it can automatically pick my only key I have for signing.
+(when EMACS-27-OR-LATER
+  (setq mml-secure-openpgp-signers '("0x96BE8C6FD89D6565")
+        mml-secure-openpgp-sign-with-sender t))
+
+(add-hook 'message-send-hook 'mml-secure-message-sign-pgpmime)
 #+END_SRC
 
 To avoid UID clashes. See [[http://pragmaticemacs.com/emacs/fixing-duplicate-uid-errors-when-using-mbsync-and-mu4e/][this]].