Hello, I have setup my computer to send email using a Protonmail account (using proton-bridge package, which acts as a proxy in localhost). My email client of choice is mu4e, which I have setup and configured to talk to localhost making use of smtpmail, the following being the relevant configuration. (setq smtpmail-smtp-user "" smtpmail-smtp-server "127.0.0.1" smtpmail-stream-type 'starttls smtpmail-smtp-service 1025) Seemingly, I have setup auth-store [1] to use password-store: (auth-source-pass-enable) (setq auth-source-debug t) I have then setup an entry in my password-store repository that matches 127.0.0.1:1025. When I attempt to send an email, auth-store debug logs in Messages buffer tell me that the correct entry was matched, the entry decrypted and used the credentials in "Netrc standard" as specified in the documentation [2] However, smtpmail-send-it fails with "invalid username or password in response": Debugger entered--Lisp error: (error "Sending failed: 454 4.7.0 invalid username or pass...") error("Sending failed: %s" "454 4.7.0 invalid username or password in response...") smtpmail-send-it() message-multi-smtp-send-mail() message--send-mail-maybe-partially() message-send-mail(nil) message-send-via-mail(nil) message-send(nil) message-send-and-exit(nil) funcall-interactively(message-send-and-exit nil) command-execute(message-send-and-exit) Here the SMTP trace: 220 127.0.0.1 ESMTP Service Ready 250-Hello hecate 250-PIPELINING 250-8BITMIME 250-ENHANCEDSTATUSCODES 250-CHUNKING 250-STARTTLS 250-AUTH PLAIN LOGIN 250 SIZE 220 2.0.0 Ready to start TLS 250-Hello hecate 250-PIPELINING 250-8BITMIME 250-ENHANCEDSTATUSCODES 250-CHUNKING 250-AUTH PLAIN LOGIN 250 SIZE AUTH PLAIN 454 4.7.0 invalid username or password QUIT 221 2.0.0 Bye Process smtpmail connection broken by remote peer Un-setting password-store as auth-store service and setting the contents of the entry that is matched in a plain text file under ~/.authinfo will succeed when attempting to send the email. I have doubts over where to file this issue (if under mu4e or in Emacs), and I am not sure if the problem is to be related to Jason Donenfeld's wrapper for pass [3] or if it is a problem with smtpmail. Please, let me know if I should direct this issue elsewhere. Cheers, -Manuel [1] -https://www.gnu.org/software/emacs/manual/html_node/auth/The-Unix-password-store.html [2] -https://www.gnu.org/software/emacs/manual/html_node/auth/Help-for-users.html#Help-for-users [3] -https://git.zx2c4.com/password-store/tree/contrib/emacs/password-store.el In GNU Emacs 28.2 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.24.36, cairo version 1.16.0) of 2023-01-18, modified by Debian built on x86-csail-01 Windowing system distributor 'TheX.OrgFoundation', version 11.0.12101007 System Description: Debian GNU/Linux bookworm/sid Configured using: 'configure --build x86_64-linux-gnu --prefix=/usr --sharedstatedir=/var/lib --libexecdir=/usr/libexec --localstatedir=/var/lib --infodir=/usr/share/info --mandir=/usr/share/man --with-libsystemd --with-pop=yes --enable-locallisppath=/etc/emacs:/usr/local/share/emacs/28.2/site-lisp:/usr/local/share/emacs/site-lisp:/usr/share/emacs/28.2/site-lisp:/usr/share/emacs/site-lisp --with-sound=alsa --without-gconf --with-mailutils 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