mh-adaptive-cmd-note-flag

mh-adaptive-cmd-note-flag is a variable defined in `mh-e.el'.
Its value is

t

Documentation:
*Non-nil means that the message number width is determined dynamically.

If you've created your own format to handle long message numbers,
you'll be pleased to know you no longer need it since MH-E adapts its
internal format based upon the largest message number if this option
is on (the default). This option may only be turned on when
`mh-scan-format-file' is set to "Use MH-E scan Format".

If you prefer fixed-width message numbers, turn off this option and
call `mh-set-cmd-note' with the width specified by your format file
(see `mh-scan-format-file'). For example, the default width is 4, so
you would use "(mh-set-cmd-note 4)".

You can customize this variable.

This variable was introduced, or its default value was changed, in version 7.0 of the MH-E package that is part of Emacs 22.1.