Hello, I meet a problem with mu4e. I wanted to send my e-mail to the mu4e mailing list, but I didn't success to subscribe to. I hope I can ask for help here. I have defined a custom field that show the E-mail user agent. And I have added it to the message view. But when I show a message, my field is nowhere. Here is my code: ;; Add an e-mail custom header that give the correspondant user agent, at the end (add-to-list 'mu4e-header-info-custom '(:user-agent . ( :name "User agent" :shortname "UsrAgnt" :help "E-mail client used by correspondant" :function (lambda (msg) (or (mu4e-fetch-field msg "User-Agent") "")))) t) ;; Add the new :user-agent field into the message view, at the end (add-to-list 'mu4e-view-fields :user-agent t) I have tested the code `(mu4e-fetch-field (mu4e-message-at-point) "User-Agent")` with `eval-expression` (M-:), and I get the User agent of the message. I also seen that in the variable `mu4e-view-fields`, I have ":tags" but I don't see any "Tags:" field in a message view. Best regards ------- Gendre Sébastien