Re: [EAI] Rather serious bug in RFC 6531 Tue, 05 January 2021 13:29 UTC

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Date: Mon, 04 Jan 2021 09:53:15 -0800 (PST)
In-reply-to: "Your message dated Mon, 04 Jan 2021 12:32:48 -0500" <20210104173248.51F3154CD6FA@ary.qy>
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To: John Levine <>
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Subject: Re: [EAI] Rather serious bug in RFC 6531
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> In article <> you write:
> >My personal opinion is that the likelyhood of older versions being
> >implemented is low and my desire to minimize number of different WITH
> >keywords is high, so I think the decision in RFC 6531 not to change
> >keywords is the right one.

> Having just done some EAI compliance tests for the UASG, I can report
> that all the systems that have any EAI support at all do what the RFC
> says. The SMTP keyword is SMTPUTF8, and the WITH clause is UTF8SMTP.
> (Well, except for Microsoft whose WITH clauses are wrong with or
> without EAI.)

FWIW, we generate the entire list of values: UTF8SMTP[A][S] and UTF8LMTP[A][S]
as necessary.

> At this point I am not aware of any live implmentations of the experimental
> version other than in IMAP at Coremail, and that one is sufficiently broken
> that I doubt anyone is using it.

> I agree we should leave it alone.

Yeah, this seems like the right choice to me as well.