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A comment on The PGP Problem. Parent comment

Re:The PGP Problem by throw0101a on Wednesday July 17, 2019 @03:00PM (#20462868)
> I do however think that it's important to note that opportunistic STARTTLS is vulnerable to downgrade attacks by mitm

See SMTP MTA Strict Transport Security (MTA-STS):

* https://tools.ietf.org/html/rfc8461

And STARTTLS Everywhere:

* https://starttls-everywhere.org/

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