Completable headers are according to `mail-complete-alist'. If none matches
current header, calls `mail-complete-function' and passes prefix arg if any."
(interactive "P")
+ ;; Read the defaults first, if we have not done so.
+ (sendmail-sync-aliases)
+ (if (eq mail-aliases t)
+ (progn
+ (setq mail-aliases nil)
+ (if (file-exists-p mail-personal-alias-file)
+ (build-mail-aliases))))
(let ((list mail-complete-alist))
(if (and (save-excursion (search-forward
(concat "\n" mail-header-separator "\n")