Have you experienced troubles with email setup and configuration on your Blackberry devices?

If so there’s a good chance that the problem might be related to your ISP or host blocking an ip range or even a specific ip that is preventing the setup of the account.
Most of the time once the email is setup, it will function properly.

Make sure you check with your hosting company to make sure that all the ips are open on the firewall.

To provide proper communication between the BlackBerry® Internet Service and the email messaging environment, the following Internet Protocol (IP) ranges must be allowed to communicate with the BlackBerry Infrastructure.

Note: The IP ranges listed in the table are in classless interdomain routing (CIDR) notation.

To provide proper communication between the BlackBerry® Internet Service and the email messaging environment, the following Internet Protocol (IP) ranges must be allowed to communicate with the BlackBerry Infrastructure.

Note: The IP ranges listed in the table are in classless interdomain routing (CIDR) notation.