On Tuesday, 2019-12-03 at 15:39:47 -05, Stefan Monnier wrote:

>> disaster-area ~/s/emacs % ./src/emacs -Q -nw -batch --eval "(progn (require
>> 'message) (setq mail-specify-envelope-from t mail-envelope-from 'header)
>> (message \"%s\" message-sendmail-envelope-from))"
>> nil
>> disaster-area ~/s/emacs % 
>
> Ha!  Thanks for tracking it down.
>
> I installed the patch below into `master` to try and avoid this problem.
>
>
>         Stefan
>
>
> diff --git a/lisp/gnus/message.el b/lisp/gnus/message.el
> index f33454e704..e60ea4f0e8 100644
> --- a/lisp/gnus/message.el
> +++ b/lisp/gnus/message.el
> @@ -854,18 +854,24 @@ message-sendmail-f-is-evil
>    :type 'boolean)
>  
>  (defcustom message-sendmail-envelope-from
> -  ;; `mail-envelope-from' is unavailable unless sendmail.el is loaded.
> -  (if (boundp 'mail-envelope-from) mail-envelope-from)
> +  'obey-mail-envelope-from
>    "Envelope-from when sending mail with sendmail.
>  If this is nil, use `user-mail-address'.  If it is the symbol
>  `header', use the From: header of the message."
> -  :version "23.2"
> +  :version "27.1"
>    :type '(choice (string :tag "From name")
>  		 (const :tag "Use From: header from message" header)
> +		 (const :tag "Obey `sendmail-envelope-from'"

`sendmail-envelope-from' here should be `mail-envelope-from'.

> +		        obey-mail-envelope-from)
>  		 (const :tag "Use `user-mail-address'" nil))
>    :link '(custom-manual "(message)Mail Variables")
>    :group 'message-sending)
>  
> +(defun message--sendmail-envelope-from ()
> +  (if (eq message-sendmail-envelope-from 'obey-mail-envelope-from)
> +      (if (boundp 'mail-envelope-from) mail-envelope-from)
> +    message-sendmail-envelope-from))
> +
>  (defcustom message-sendmail-extra-arguments nil
>    "Additional arguments to `sendmail-program'."
>    ;; E.g. '("-a" "account") for msmtp
> @@ -5884,11 +5890,11 @@ message-user-mail-address
>  
>  (defun message-sendmail-envelope-from ()
>    "Return the envelope from."
> -  (cond ((eq message-sendmail-envelope-from 'header)
> +  (cond ((eq (message--sendmail-envelope-from) 'header)
>  	 (nth 1 (mail-extract-address-components
>  		 (message-fetch-field "from"))))
> -	((stringp message-sendmail-envelope-from)
> -	 message-sendmail-envelope-from)
> +	((stringp (message--sendmail-envelope-from))
> +	 (message--sendmail-envelope-from))
>  	(t
>  	 (message-make-address))))
>  
> diff --git a/lisp/mail/emacsbug.el b/lisp/mail/emacsbug.el
> index 1c2f11680b..fea7619b50 100644
> --- a/lisp/mail/emacsbug.el
> +++ b/lisp/mail/emacsbug.el
> @@ -239,8 +239,8 @@ report-emacs-bug
>        ;; Stop message-mode stealing the properties we will add.
>        (set (make-local-variable 'message-strip-special-text-properties) nil)
>        ;; Make sure we default to the From: address as envelope when sending
> -      ;; through sendmail.
> -      (when (and (not message-sendmail-envelope-from)
> +      ;; through sendmail.  FIXME: Why?
> +      (when (and (not (message--sendmail-envelope-from))
>  		 (message-bogus-recipient-p (message-make-address)))
>  	(set (make-local-variable 'message-sendmail-envelope-from) 'header)))
>      (rfc822-goto-eoh)

dme.
-- 
But are you safe Miss Gradenko?
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