/usr/lib/courier/couriermlm/webmlmprocessed.html is in courier-mlm 0.76.3-5+deb9u1.
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 | <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 3.2//EN">
<html>
<head>
<meta name="generator" content="Bluefish 1.0.7">
<title>Courier Mailing List Manager</title>
</head>
<body>
<h1>Request processed</h1>
<p>Your request was processed, and a confirmation E-mail was sent to you.</p>
<p><a href="[@LISTURL@]" title="Main list page">Continue</a></p>
</body>
</html>
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