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Re: [ietf-smtp] Quoted-Printable-8bit

John R Levine <johnl@taugh.com> Wed, 31 March 2021 00:39 UTC

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Date: Tue, 30 Mar 2021 20:39:03 -0400
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From: John R Levine <johnl@taugh.com>
To: John C Klensin <john-ietf@jck.com>, ietf-smtp@ietf.org
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Subject: Re: [ietf-smtp] Quoted-Printable-8bit
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> I don't have a strong position on the 8BITMIME question itself,
> but, as people think about changing or ignoring the requirement,
> they should probably keep in mind that SMTPUTF8 (RFC 6530ff)
> require 8BITMIME, i.e., advertising SMTPUTF8 without also
> advertising 8BITMIME is invalid. ...

I couple of years ago I did some surveys of MTAs for the UASG.  Of 56,901 
MTAs I survyed, 56,262 advertised 8BITMIME.  The only identifiable MTA not 
offering it was an obscure Windows MTA called Mailenable.

There were a few Postfix and Exim servers not advertising it (165 out of 
28,000 for Exim, 15 out of 14,739 for Postfix) which I assume were 
configuration errors.

It would be resonable to make 8BITMIME a MUST now.  Ever since the last 
PDP-10 left the net about 30 years ago, every machine on the Internet uses 
8 bit bytes which makes 8BITMIME close to free to implement.

Regards,
John Levine, johnl@taugh.com, Taughannock Networks, Trumansburg NY
Please consider the environment before reading this e-mail. https://jl.ly

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