Here are described the following variables.
Set header fields that you want to insert every time when you write messages to `mew-header-alist' as an associate list. The following is an example.
(setq mew-header-alist
'(("X-fingerprint:" . "6B 63 38 88 67 5E 96 8E CE A4 62 73 3F 11 64 94")
("X-URL:" . "http://www.mew.org/~kazu/")))
To customize citation label, define field to cite in `mew-cite-fields' and format in `mew-cite-format'. Define citation symbol to `mew-cite-prefix'. The default declaration is as follows:
(defvar mew-cite-fields '("From:" "Subject:" "Date:"))
(defvar mew-cite-format "From: %s\nSubject: %s\nDate: %s\n\n")
(defvar mew-cite-prefix "> ")
To add Message-ID: to citation label and to change the prefix with a user name, take this way.
(setq mew-cite-fields '("From:" "Subject:" "Date:" "Message-ID:"))
(setq mew-cite-format "From: %s\nSubject: %s\nDate: %s\nMessage-ID: %s\n\n")
(setq mew-cite-prefix-function 'mew-cite-prefix-username)