(setq mail-dont-reply-to-names
(concat
;; `rmail-default-dont-reply-to-names' is obsolete.
- (if rmail-default-dont-reply-to-names
+ (if (bound-and-true-p rmail-default-dont-reply-to-names)
(concat rmail-default-dont-reply-to-names "\\|")
"")
(if (and user-mail-address