For a test name, I wonder if the base name could be used. e.g., query
multi.surbl.org for a 127.0.0.2 A record . This is completely out of
band in the sense that you wouldn't accidentally trigger it because of
something in a message body. OTOH it might add other difficulties such
as when having the base name point to a website.
The base name often points to a web site. That would be a problem.
R's,
John
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