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Mandatory STARTTLS ?

From John Levine <johnl@taugh.com>
Newsgroups comp.mail.sendmail
Subject Mandatory STARTTLS ?
Date 2026-01-29 19:45 +0000
Organization Taughannock Networks
Message-ID <10lgddc$1ud8$1@gal.iecc.com> (permalink)

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In the IETF last call about the SMTP applicability statement, we are
having a long argument about making STARTTLS mandatory.

One group says (sligtly oversimplifying) that it's more secure, we should
mandate it.

The other group says there are still corner cases where plain text is
useful, e.g., dusty printers saying they're out of paper, or mail to
postmaster telling him that his cert has expired, and if you want to
mandate TLS on your own system, you have MTA-STS and DANE.

What do you think?  Any chance sendmail would completely remove non-STARTTLS
mail?
-- 
Regards,
John Levine, johnl@taugh.com, Primary Perpetrator of "The Internet for Dummies",
Please consider the environment before reading this e-mail. https://jl.ly

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Mandatory STARTTLS ? John Levine <johnl@taugh.com> - 2026-01-29 19:45 +0000
  Re: Mandatory STARTTLS ? Claus Aßmann <INVALID_NO_CC_REMOVE_IF_YOU_DO_NOT_POST_ml+sendmail(-no-copies-please)@esmtp.org> - 2026-01-30 00:57 -0500
  Re: Mandatory STARTTLS ? Marco Moock <mm@dorfdsl.de> - 2026-01-30 07:38 +0100

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