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Page 7: POP settings

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For completeness.

There are two ways of adding security to a protocol:

The old way is to use a different port and run the whole thing over
TLS. In those days TLS was known as SSL, so SSL is often used to
refer to this mode, but TLS-on-connect is a more accurate name.

The more modern way is to save port numbers by adding a command
(such as STARTTLS) to the protocol which allows you to restart the
conversation on top of TLS inside the same connection. The
disadvantage of this mode is that it's less obvious that you have
the security settings correct.

Make sure you say "this server requires a secure connection"

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