On 01/09/2019 12:03 PM, Paul Smith wrote:
SMTPS on port 26 is realistically no better than STARTTLS on port 25.
And STARTTLS on port 25 is already widely implemented, widely deployed
and working. What would be the point of making things more complicated
with no gain?
Devil's advocate question: Do we (the community) care about improved
My intuition is no; interest in all things SMTP RTT-related has ebbed
and flowed over the years (pipelining, connection caches, etc.), but it
never seemed like a big enough issue to be worth burning a port number.
(On the Web, you've got companies spending millions to shave a few
milliseconds off RTT, and the single RTT of TLS v1.3 is a Very Big Deal.
But that's a completely different problem space.)
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