/etc/nmh/forwcomps 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.
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%; forwcomps - Our components file when we're using "forw"
%;
%; We want people to be able to use the components from forwarded
%; messages in this file, so we have to cheat a bit. We create a series
%; of pseudo-components with a "nmh" prefix to represent arguments given
%; on the command line. We don't do this for %{fcc} since there's already
%; precedence for this from "repl".
%;
%; If we're given multiple messages to forward, provide the components
%; from the first one. Can't really think of anything better to do there.
%;
%; Generate a "From:" header; if we don't give one, use %(localmbox)
%;
%<{nmh-from}%|%(void(localmbox))%>%(void(width))%(putaddr From: )
%;
%; Generate To: and cc: headers; if we're given ones, put something in there
%; otherwise leave them blank.
%;
%<{nmh-to}%(void(width))%(putaddr To: )%|To:%>
%<{nmh-cc}%(void(width))%(putaddr cc: )%|cc:%>
%;
%; If we're not given a -fcc switch, then default to +outbox
%;
Fcc: %<{fcc}%(putstr)%|+outbox%>
%;
%; If we're not given a -subject switch, then use the original message
%; subject, but adding (fwd) on the end. I got this idea from exmh, and
%; I've always liked it.
%;
Subject:%<{nmh-subject} %(trim)%(putlit)%?{subject} %(trim)%(putlit) (fwd)%>
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