message-header-format-alist

message-header-format-alist is a variable defined in `message.el'.
Its value is shown below.

Documentation:
Alist used for formatting headers.

Value:

((From)
 (Newsgroups)
 (To)
 (Cc)
 (Subject)
 (In-Reply-To)
 (Fcc)
 (Bcc)
 (Date)
 (Organization)
 (Distribution)
 (Lines)
 (Expires)
 (Message-ID)
 (References . message-shorten-references)
 (User-Agent))