Try the following actions:

• Check that your BlackBerry® device is connected to the wireless network. If you are not in a wireless coverage area, you should receive messages when you return to a wireless coverage area.
• Reset your device. Connect to the network and try again.
• If you created an email address or added an existing email address to your device using the email set-up screen in the Set-up application, check that you have received an activation message on your device from the BlackBerry® Internet Service. If you have not received an activation message (the message might take a short period of time to arrive), in the Set-up application, open the email set-up screen to send a service book to your device.
• If you have not received a registration message from the wireless network, register your device. On the Home screen or in a folder, click the Options icon. Click Advanced Options > Host Routing Table. Press the key > Register Now.
• Verify that data service is turned on.
• If you use email filters, verify that the options for email filters are set correctly.
• Verify that email forwarding is turned on and that you have selected all the email folders, including your inbox folder, that you want to receive email from.
• Verify that your device is not blocking messages. For more information, contact your administrator.