I've often wondered why we don't have any standardized test cases for email validation. A simple list of known good, and known bad addresses to use as test case

I've often wondered why we don't have any standardized test cases for email validation. A simple list of known good, and known bad addresses to use as test cases would really help. You could almost make a game out of finding valid addresses that are not matched, or invalid addresses that are false positives, or optimizing candidate regexps. The list could be continuously growing as new variations are discovered, and tested against previously submitted candidate regexps.