/etc/nmh/scan.timely is in nmh 1.6-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 | %4(msg)%<(cur)+%| %>%<{replied}-%?{encrypted}E%| %>\
%(void(rclock{date}))\
%<(gt 15768000)%03(month{date})%(void(year{date}))%02(modulo 100)\
%?(gt 604800)%02(mday{date})%03(month{date})\
%?(gt 86400) %(day{date}) %|\
%02(hour{date}):%02(min{date})%>\
%<{date} %|*%>\
%<(mymbox{from})%<{to}To:%14(decode(friendly{to}))%>%>\
%<(zero)%17(decode(friendly{from}))%> \
%(decode{subject})%<{body}<<%{body}%>
|