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joveian
on April 11, 2024
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Why can't my mom email me?
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
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https://www.mailhardener.com/kb/mta-sts