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.

206.51.26.0/24
193.109.81.0/24
204.187.87.0/24
206.53.144.0/20
216.9.240.0/20
67.223.64.0/19
93.186.16.0/20
68.171.224.0/19
74.82.64.0/19
173.247.32.0/19
178.239.80.0/20

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.