example.(com|net|org) should not be a valid domain because it is a
reserved domain so it is valid to use for a test.
The problem is that those names occur in a certain amount of legit mail,
and a SURBL like check looking for domain name strings might well match
them.
That's why I like test, it's not likely to accidentally get picked out
of a message and interpreted as a domain name.
R's,
John
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