> On Mar 22, 2018, at 2:59 PM, Martin Thomson <[email protected]> wrote:
>
> https://tools.ietf.org/html/draft-trammell-optional-security-not-00 is
> relevant.
A reasonable guiding principle, but sometimes *availability* trumps security.
This is sufficiently often the case with email to make explicit preference for
delivery above all other concerns a necessary feature.
When a user gets a delay warning for their initial attempt to send a
time-sensitive
message, it should be possible to resend the message with an explicit opt-out of
enhanced security protections (beyond unauthenticated opportunistic STARTTLS).
--
Viktor.
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