message-beginning-of-line

message-beginning-of-line is an interactive compiled Lisp function in `message.el'.


(message-beginning-of-line &optional N)

Move point to beginning of header value or to beginning of line.
The prefix argument N is passed directly to `beginning-of-line'.

This command is identical to `beginning-of-line' if point is
outside the message header or if the option `message-beginning-of-line'
is nil.

If point is in the message header and on a (non-continued) header
line, move point to the beginning of the header value or the beginning of line,
whichever is closer. If point is already at beginning of line, move point to
beginning of header value. Therefore, repeated calls will toggle point
between beginning of field and beginning of line.