[idn] internationalized email addresses

[Adam M. Costello]

It just occurred to me that once people can put Unicode characters into
domain names, they'll also want to put them before the @-sign in email
addresses.  How is that going to work?

I'm not sure it makes sense to try to allow Unicode characters in
domain names without simultaneously thinking about how to allow them
in the other parts of email addresses and URIs.  Are there other
name/address-like things that need to be considered as well?

AMC