Re: [EAI] SMTPUTF8 and 8BITMIME

Mark Martinec <Mark.Martinec+ietf@ijs.si> Wed, 15 April 2015 14:42 UTC

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Date: Wed, 15 Apr 2015 16:42:38 +0200
From: Mark Martinec <Mark.Martinec+ietf@ijs.si>
To: Franck Martin <fmartin@linkedin.com>
Organization: Jozef Stefan Institute
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Cc: ima <ima@ietf.org>
Subject: Re: [EAI] SMTPUTF8 and 8BITMIME
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2015-04-15 11:24, Franck Martin wrote:
> it seems that a few MTA can be thrown at an email with a EAI
> RFC5321.mailfrom and pass the message fine to other MTA or local
> delivery, as long as the MTA supports 8BITMIME and the RFC5321.rcptto
> is a standard email address.
> 
> replying to such email is a challenge, but it does not seem any MTA or
> MUA (with 8BITMIME) will complain because the RFC5321.from is an
> EAI...
> 
> What’s your experience?

Tried it with Postfix (with SMTPUTF8 disabled):

it gladly accepts UTF-8 in localpart of a RFC5321.mailfrom (or in the
RFC5321.rcptto) address, as well as UTF-8 in a mail header section - but
rejects UTF-8 in domain part of such address (501 5.1.7 Bad sender
address syntax).

... unfortunately the cyrus LMTP server then rejects the 
RFC5321.mailfrom
(501 5.5.4 Syntax error in parameters) - although it does survive UTF-8
in a mail header section.

   Mark