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/usr/share/mailutils/mh/mhl.usenet is in mailutils-mh 1:3.4-1.

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; USENET-style format file for GNU repl
;
; 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>.
;
:
message-id:nocomponent,nonewline,formatfield="In message %{text}, "
from:nocomponent,formatfield="%(friendly{text}) writes:"
body:component=">",overflowtext=">",overflowoffset=0