mh-scan-format-nmh

mh-scan-format-nmh is a variable defined in `mh-scan.el'.
Its value is

"%4(msg)%<(cur)+%| %>%<{replied}-%?(nonnull(comp{to}))%<(mymbox{to})t%>%?(nonnull(comp{cc}))%<(mymbox{cc})c%>%?(nonnull(comp{bcc}))%<(mymbox{bcc})b%>%?(nonnull(comp{newsgroups}))n%>%<(zero) %>%02(mon{date})/%02(mday{date})%<{date} %|*%>%<(mymbox{from})%<{to}To:%14(decode(friendly{to}))%>%>%<(zero)%17(decode(friendly{from}))%>  %(decode{subject})%<{body}<<%{body}%>"

Documentation:
*Scan format string for nmh.
This string is passed to the scan program via the -format arg.
This format is identical to the default except that additional
hints for fontification have been added to the fifth
column (remember that in Emacs, the first column is 0).

The values of the fifth column, in priority order, are: "-" if
the message has been replied to, t if an address on the To: field
matches one of the mailboxes of the current user, "c" if the Cc:
field matches, "b" if the Bcc: field matches, and "n" if a
non-empty Newsgroups: field is present.