Re: Can we back up a bit and ask some basic questions? Analternate model

Your document is well argued.  We certainly shouldn't blindly assume
that just because the ACE vs just-send-8 issue was argued to death in
the IDN WG, the trade-offs between the two approaches when applied to
IMAs will automatically be the same as those for IDNs.  (Though I can
also understand that this group probably really doesn't want to go
there again.)

But I'd urge you to consider the four scenarios I just put forward in
the thread "What is IMAA: some scenarios for deployment"

Scenario 1a: with IMAA there's a reasonable hope of basic support with
just an updated mail client, and better support with minor updates to
the ISPs sign-up systems.  With UTF8ADDRESSES this will require in
addition a major upgrade to the ISP's mail infrastructure.

Scenario 1b: IMAA and UTF8ADDRESSES both require a major upgrade to
the ISP's infrastructure.

Scenario 2a: IMAA requires only an upgrade to the mail clients;
UTF8ADDRESSES requires an upgrade to the clients, the organization's
MTA, and the ISP's mail infrastructure (so that the backup MX will
continue to work).

Scenario 2b: IMAA requires upgrades to the mail clients and, as
currently specified in the draft, an upgrade to the organization's MTA
(though the need to upgrade the MTA might disappear depending on the
design decisions we take in IMAA).  UTF8ADDRESSES requires upgrades to
the clients, the MTA and the ISP's infrastructure.

	 -roy