/usr/share/courier/webadmin/notsupp.html is in courier-webadmin 0.68.2-1ubuntu7.
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 22 23 24 25 26 | <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
    "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
  <meta name="MSSmartTagsPreventParsing" content="TRUE" />
  <meta name="Author" content="Sam Varshavchik" />
  <!-- Copyright 2001 Double Precision, Inc.  See COPYING for -->
  <!-- distribution information. -->
  <title>@PACKAGE@ @VERSION@ - not available</title>
  <!--
  [#___#]
  -->
</head>
<body text="#000000" bgcolor="#FFFFFF" link="#0000EE" vlink="#0000EE"
alink="#FF0000">
<h1><tt>@PACKAGE@ @VERSION@</tt> - not available</h1>
<p>This setting is not available because your system does not have this option
enabled.</p>
<hr>
<p><a href="@MAINMENU@">Main Menu</a></p>
</body>
</html>
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