32.4.2 Mail Header Editing
Message mode provides the following special commands to move to particular header fields and to complete addresses in headers.
C-c C-f C-tβ
Move to the βToβ header (message-goto-to).
C-c C-f C-sβ
Move to the βSubjectβ header (message-goto-subject).
C-c C-f C-cβ
Move to the βCCβ header (message-goto-cc).
C-c C-f C-bβ
Move to the βBCCβ header (message-goto-bcc).
C-c C-f C-rβ
Move to the βReply-Toβ header (message-goto-reply-to).
C-c C-f C-fβ
Move to the βMail-Followup-Toβ header field (message-goto-followup-to).
C-c C-f C-wβ
Add a new βFCCβ header field, with file-name completion (message-goto-fcc).
C-c C-bβ
Move to the start of the message body (message-goto-body).
TABβ
Complete a mailing address (message-tab).
The commands to move point to particular header fields are all based on the prefix C-c C-f (βC-fβ is for βfield"). If the field in question does not exist, the command creates one (the exception is mail-fcc, which creates a new field each time).
The command C-c C-b (message-goto-body) moves point to just after the header separator lineβthat is, to the beginning of the body.
While editing a header field that contains addresses, such as βTo:β, βCC:β and βBCC:β, you can complete an address by typing TAB (message-tab). This attempts to insert the full name corresponding to the address based on a couple of methods, including EUDC, a library that recognizes a number of directory server protocols (see EUDC in The Emacs Unified Directory Client). Failing that, it attempts to expand the address as a mail alias (see Mail Aliases). If point is on a header field that does not take addresses, or if it is in the message body, then TAB just inserts a tab character.