Some notes for EAI reading call: 1) page 12 " for a variety of reasons, a UTF-8 local-part cannot be encoded as punycode or an A-label. Some readers may still prefer punycode. Can we list some detail reasons for why not?
Do you mean for your own users or for others? For your own users you can do whatever you want with local parts including punycoding them, but since punycode looks like random text the addresses will be very hard to remember or to tell people. For others, it won't work because the punycoded address isn't the same mailbox as the UTF-8 address.
I remebered that the normalization issues had been discussed in EAI WG. the suggestion is that we can not do the normalization to the local part of the email address. different normalization may produce different result for the local part, which may lead to different local part the owner may not recognize too. So only the email owner system may do some normalization to his own address, can not deal with other system produced EAI address.
Quite right, I'll put in something about that. Regards, John Levine, john.levine@standcore.com Standcore LLC