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Re:STARTTLS Everywhere by johnp_ on Tuesday June 26, 2018 @03:41PM (#17403441)
Implicit TLS is already favored for Email submission and access per RFC8314: https://tools.ietf.org/html/rfc8314

The problem is partly because we don't have an assigned port for MTA2MTA implicit TLS. Otoh DANE also already provides a way to have mandatory TLS for MTA2MTA traffic.

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