STARTTLS vs SSL/TLS [closed]

The clearest explanation that I’ve read is from FastMail:

SSL and TLS both provide a way to encrypt a communication channel
between two computers (e.g. your computer and our server). TLS is the
successor to SSL and the terms SSL and TLS are used interchangeably
unless you’re referring to a specific version of the protocol.

STARTTLS is a way to take an existing insecure connection, and upgrade
it to a secure connection using SSL/TLS. Note that despite having TLS
in the name, STARTTLS doesn’t mean you have to use TLS, you can use

Read the rest of the info they have, including a discussion of port numbers and POP/IMAP vs SMTP, here:

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