[Dovecot] Disable unsecure POP3 at all (Dovecot 2.1)

[Андрей Кумыков]

Hi to all.
Is it possible to disable unsecure POP3 protocol at all in Dovecot 2.1?
There was "protocols" option in 1.x version, and there was separate pop3 and 
pop3s modules.
There is no "pop3s" in configuration files in 2.1.