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Currently allows the following (invalid) email addresses:
 If a plain address (i.e. just a the username (no @) is invalid) then surely email@hostname should be okay?
(Yes, I know that reasoning is stretching, but I do think both or neither should be allowed)
 Obviously the .web tld could exist in the future
 111.222.333.44444 as a domain name certainly shouldn't be allowed, unless the RFCs have been changed to allow numeric TLDs?
I'm not how this compares to Microsoft's EmailAddressAttribute as I don't have access to that currently, but if .NET fails in the same manner, I think MONO should be bug compatible.
Master has same implementation as .net