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The daemons must be able to support TLS encryption of the session. So far as I know, Cyrus only does IMAP (not POP) so you would need a separate POP3 daemon--I think. In any case, consult your Cyrus documentation to determine if it supports TLS, and if it does, how to implement it.
By the way the TLS encrypted version of all e-mail protocols have now been standardized as <protocol>S so the appropriate service names are POP3S, IMAP4S, and SMTPS (Postfix does support TLS by the way).
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