Blackberry email is “pushed” to Blackberry phones (BB) using two different RIM products. The email account assigned by your cell carrier resides on a Blackberry Enterprise Server (BES) and every other account you set up uses the Blackberry Internet Service (BIS).

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If you receive a message from the System Administrator such as this:

The size limit of 1000 MB for mailbox email hidden; JavaScript is required has been exceeded. Incoming mail to that mailbox is currently being rejected.

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