Re: [idn] internationalized email addresses

["D. J. Bernstein" <djb@cr.yp.to>]

ned.freed@innosoft.com writes:
> There is little point in considering local parts now unless they
> additionally constrain the problem. (AFAIK they do not.)

Actually, they do. There are a huge number of mailing lists run by my
ezmlm software and its variants; these programs use

   Return-Path: <list-return-msgnum-user=userhost@listhost>

for deliveries to user@userhost. If your mail software has small limits
on address length, switching userhost from a UTF-8 IDN to an ACE IDN
will drastically increase your chance of hitting those limits.

---Dan