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Re: [Emailcore] Ticket #14: G.7.8. Review different size limits

John Levine <johnl@taugh.com> Sun, 18 July 2021 03:09 UTC

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Date: Sat, 17 Jul 2021 23:09:14 -0400
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From: John Levine <johnl@taugh.com>
To: emailcore@ietf.org
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Subject: Re: [Emailcore] Ticket #14: G.7.8. Review different size limits
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It appears that Viktor Dukhovni  <emailcore@ietf.org> said:
>On Sat, Jul 17, 2021 at 06:09:40PM -0400, John Levine wrote:
>
>> My MTA is qmail which has never recoded stuff on the fly.  Neither
>> does Postfix or sendmail, at least not with their default settings.
>
>Actually, given an 8BITMIME message and a nexthop SMTP server that does
>not support 8BITMIME, Postfix will in fact (by default) do on the fly
>MIME quotable-printable encoding.
>
>    http://www.postfix.org/postconf.5.html#disable_mime_output_conversion

I believe it, but I don't believe it's useful any more.

IN 2019 I collected some stats for the UASG, going through TLD zone files,
finding hosts with MX records, and sniffing the SMTP EHLO response for 8BITMIME and
SMTPUTF8.  While I didn't find all that many advertising SMTPUTF8, the
number that advertised 8BITMIME rounded to 100% to several digits of precision.

R's,
John

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