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However, the wide use of MTA-STS is quite recent so downgrade attacks have been possible. In fact, Fastmail seems to currently be messing up MTA-STS, I'm not s
by joveian 3y ago
However, the wide use of MTA-STS is quite recent so downgrade attacks have been possible. In fact, Fastmail seems to currently be messing up MTA-STS, I'm not sure if they are intending to enable it or not.
https://www.mailhardener.com/kb/mta-sts https://www.mailhardener.com/kb/mta-sts