how to disable port 143

Hello,

I have commented out this line in 10-master.conf:

service imap-login { inet_listener imap { #port = 143 }

But this doesn't close the port 143. So I have changed it to:

service imap-login { inet_listener imap { address = 127.0.0.1 port = 143 }

This let port 143 listen on local address.

my question, is it possible to close port 143 entirely in dovecot?

Thanks.