this post was submitted on 28 Nov 2023
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This is true AND untrue at the same time! It's true that most e-mail providers will talk to other e-mail providers with TLS, but it's trivial to downgrade the connection in most circumstances. If you can man-in-the-middle e-mail servers you can just say "hey, I'm the e-mail provider you're trying to talk to, I don't support TLS, talk to me in plain text!" and the senders will probably oblige. There's a few standards to try to address this problem, like DANE (which actually solves the problem, but is unsupported by all large e-mail providers), and mta-sts which is a much weaker standard (but supported by gmail and outlook). In practice there's a good chance that your e-mail is reasonably well secured, but it's absolutely not a guarantee.
That depends on the specific TLS setup. Badly configured TLS 1.2 would allow downgrade attacks, TLS 1.3 would not. I highly doubt the "in most circumstances" line, my guess would be that at least the big ones like gmail don't allow unsecured communication with their servers at all. If not for their users's privacy, then at least to combat spam.