[UA-EAI] Thoughts on Downgrading

[Mark Svancarek]

Clarifying, since this question comes up from time to time:



Also note that only the initial sender can do this.  If mail goes A->B->C, A can downgrade if the A->B hop can't do EAI, but B cannot if B->C can't



Is this a MUST or a SHOULD (recognizing that RFC-style SHOULD is still very firm)?



/marksv

-----Original Message-----
From: ua-eai-bounces at icann.org [mailto:ua-eai-bounces at icann.org] On Behalf Of John Levine
Sent: Saturday, November 4, 2017 7:21 PM
To: Don Hollander <don.hollander at icann.org>
Cc: ua-eai at icann.org
Subject: Re: [UA-EAI] Thoughts on Downgrading



On Fri, 3 Nov 2017, Don Hollander wrote:

> The UASG will (after further consultation) include the following as a Good Practice (not best practice) guide for Downgrading:

>

> -        The EAI Mailbox provider establishes an EAI address and an ASCII alias when the mailbox is set up.

>

> -        The ASCII alias will have a display name equal to the EAI Address.

>

> -        When a non-EAI compliant mail system is encountered, the EAI MTA will revert with the ASCII alias and Display Name.

>

> -        The ASCII Alias should not default to a Punycode conversion of the mailbox name because bi-directional equivalence cannot be guaranteed.



Also note that only the initial sender can do this.  If mail goes A->B->C, A can downgrade if the A->B hop can't do EAI, but B cannot if B->C can't.



Regards,

John Levine, john.levine at standcore.com<mailto:john.levine at standcore.com>

Standcore LLC



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