Changing IMAP ports

Is there a way to Change the IMAP ports in cPanel? I have CSF and cPhulk configured and in the past two months, we have over 4000 distributed IMAP attack entries in CSF/iptables. Between yesterday and so far today almost 2000 in CSF this has to stop, these hackers/spammers are getting out of hand with these IMAP attacks. We need to lower the number of entries in CSF/iptables. Scott