Blackberry email setup on cpanel linux servers
Blackberry customers will not be able to fetch from mail servers running cpanel in linux if in case a firewall is there.
The following ips have to be white-listed for it to work with out any issues
Note: The IP ranges listed in the table are in classless interdomain routing (CIDR) notation.
The ranges are as per blackberry document.
If you are using csf then the above ips have to be added in csf.allow and csf has to be restarted.