mh-scan-from-mbox-width

mh-scan-from-mbox-width is a variable defined in `mh-scan.el'.
Its value is

17

Documentation:
Number of columns consumed with the "From:" line in `mh-scan-format'.
This column will have a friendly name or e-mail address of the
originator, or a "To: address" for outgoing e-mail messages.