This file is indexed.

/etc/nmh/mhl.headers is in nmh 1.6-16.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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; mhl.headers
;
; Default format file for displaying headers in
; MIME messages.  mhn calls the mhlproc with this
; filter to display message header.
;
overflowtext="***",overflowoffset=5
leftadjust,compwidth=9
ignores=msgid,message-id,received,content-type,content-transfer-encoding,content-id
Date:formatfield="%<(nodate{text})%{text}%|%(pretty{text})%>"
To:
cc:
From:decode
Subject:decode
:
extras:nocomponent
: