Great example of why using placeholders like xxx@deleteduser.com is a bad idea.
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Apart from example.com are their any documentation only domains?
Credit cards have test numbers, IP addresses have TEST-NET1,2,and 3 for ipv4 and 2001:db8:: for V6.
.onion or arpa are good ones.
There was a talk at 39C3 about abandoned (German) government domains (scroll down for an English audio track).


