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cPanel offers you two mail servers, Courier and Dovecot. It can be selected from WHM Main >> Service Configuration >> Mailserver Selection. Additionally, you may disable IMAP and POP3 servers.
In simple terms, the difference between Virtuozzo and Xen is that the former is proprietary and must be licensed per VM. Xen is open-source and is free to use by anybody. OpenVZ is the free version of virtuozzo but it is limited to the command line.
Opening ports and closing ports in CSF is easy. But it can be a bit tricky to open a port to a specific IP in CSF.
RBL stands for Realtime Black lists and it mainly works for email servers. RBL is a collections of IP addresses or network addresses which has been found to be spamming. So the email servers will connect to these RBLs before accepting email from an IP and make sure that the IP from with the mail arrives is free from spams.
Keeping MySQL on the server up to date is essential for the efficiency of codes . There are times when we just cannot let cPanel handle an upgrade because we may end up having our databases not working properly after an upgrade. So, therefore we need to do upgrades of MySQL manually.