How do I turn IMAP (port 143) off while IMAPS (port 993 SSL) keeps running?

Simple question, the subject line says it all. The target system is Mountain Lion Server (10.8)
I tried editing 10-master.conf in dovecot's conf.d directory, commenting a listener on 143, but that did not help. So, it is not that easy.

Why would you want to disable port 143, by default all clients will attempt to connect through 993 with SSL support when available.
Well, a machine may be a laptop that tries to connect when in the outside world and there might be an attempt made with passwords in the clear. I do not oversee all the possibilities, but if I can make sure that it doesn't work when on the LAN I know for sure it won't be attempted when outside the LAN.
Another option was the firewall on the server. But I rather stop things at the source.

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