/usr/share/mailutils/mh/replgroupcomps 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 18 19 20 21 | %; This is the default replgroupcomps file for Mailutils MH.
%;
%; GNU Mailutils -- a suite of utilities for electronic mail
%; Copyright (C) 2003, 2010-2012, 2014-2017 Free Software Foundation,
%; Inc.
%; Distributed under GPL.
%;
%(lit)%(formataddr{mail-followup-to})\
%<(nonnull)%(void(width))%(putaddr To: )\n\
%|\
%(lit)%(formataddr %<{mail-reply-to}%?{reply-to}%?{from}%?{sender}%?{return-path}%>)\
%<(nonnull)%(void(width))%(putaddr To: )\n%>\
%(lit)%<(rcpt to)%(formataddr{to})%>%<(rcpt cc)%(formataddr{cc})%>%<(rcpt me)%(formataddr(localmbox))%>\
%<(nonnull)%(void(width))%(putaddr cc: )\n%>%>\
%;
%<(mymbox{from})%<{fcc}Fcc: %{fcc}\n%>%>\
Subject: %<{subject}%(putstr %<(profile reply-prefix)%|\
%(void Re:)%>) %(void(unre{subject}))%(trim)%(putstr)%>
%(lit)%<(in_reply_to)%(void(width))%(printhdr In-reply-to: )\n%>\
%(lit)%<(references)%(void(width))%(printhdr References: )\n%>\
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