/usr/share/mailutils/mh/scan.mailx is in mailutils-mh 1:3.4-1.
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 11 12 13 14 15 16 17 | %; Mimic the mailx(1) output.
%;
%; GNU Mailutils -- a suite of utilities for electronic mail
%; Copyright (C) 2003, 2010-2012, 2014-2017 Free Software Foundation,
%; Inc.
%; Distributed under GPLv3+. See <http://gnu.org/licenses/gpl.html>.
%;
%<(cur)>%| %>\
%<{status} %|N%>\
%<{replied}R%?{encrypted}E%| %>\
%4(msg) \
%<(mymbox{from})%<{to}To: %13(decode(friendly{to}))%>%>\
%<(zero)%17(decode(friendly{from}))%> \
%3(day{date}) %3(month{date}) %02(mday{date}) \
%02(hour{date}):%02(min{date}) \
%(decode{subject})
%; End of scan.mailx
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