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Re: mail crypto, was the introduction problem, was Email

John Levine <johnl@taugh.com> Wed, 04 May 2022 19:03 UTC

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Date: Wed, 04 May 2022 15:03:12 -0400
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From: John Levine <johnl@taugh.com>
To: ietf@ietf.org
Subject: Re: mail crypto, was the introduction problem, was Email
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It appears that Keith Moore  <moore@network-heretics.com> said:
>> How much do we think 'transmitted in cleartext' exists anymore?
>TLS is still negotiated on a per-hop basis, and STARTTLS is subject to 
>downgrading attacks from well-placed intermediaries.

Only for domains that don't support MTA-STS or DANE TLSA. I think you
will find that the majority of mail operators, certainly by volume,
support at least one of them.

R's,
John

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