Keith Moore wrote:
a. encode domain names in IDNA
b. encode local-parts in an encoding that is to be defined, but which
hopefully is very similar, perhaps identical, to IDNA
The problem here is that nameprep is stricter than mailbox naming has
historically allowed for. Specifically, the use of mandatory lowercase
characters in nameprep will prohibit mixed-case local-parts.
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Eric A. Hall http://www.ehsco.com/
Internet Core Protocols http://www.oreilly.com/catalog/coreprot/