ietf-822
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Re: IDN (was Did anyone tell Microsoft yet?)

2002-05-03 12:53:18

Actually, it is not as daft as all that. If an MTA needs to know whether
it is dealing with an "internationalized" MUA, then there may be several
ways it could be done. Obviously, one is an EHLO on port 25, followed by a
response "yes, I speak International". But using a different port number
might be a possible alternative.

this doesn't work with NAPTs.  and port #s are a lousy protocol negotiation
mechanism.