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Process flow: Sending a message that contains an
attachment from a BlackBerry device
1. A user attaches a file to a message on a BlackBerry device and sends the message.
• If the BlackBerry device is not running BlackBerry Device Software version 4.2 or later, and if the BlackBerry device
does not have a CMIME service book that indicates that the BlackBerry Enterprise Server supports attachment
uploads, the Add Attachment menu item does not appear on the BlackBerry device.
• If the user tries to attach a file that exceeds the maximum file size that you specified, a notification appears and the
user cannot attach the file.
2. The BlackBerry device compresses and encrypts the message, and sends the message to the wireless network over
port 3101.
The BlackBerry device formats the header of the message to indicate that a large attachment is part of the message.
The BlackBerry device does not send the attachment content.
3. The wireless network sends the message to the BlackBerry Enterprise Server.
4. The BlackBerry Dispatcher decrypts and decompresses the message using the device transport key of the BlackBerry
device.
If the BlackBerry Dispatcher cannot decrypt the message using the device transport key, the BlackBerry Enterprise
Server ignores the message and sends an error message to the BlackBerry device.
5. The BlackBerry Messaging Agent stores the message properties in the user’s mailbox.
The BlackBerry Messaging Agent sends a request for the attachment content through the BlackBerry Dispatcher to the
BlackBerry device.
6. The BlackBerry device sends the attachment content through the BlackBerry Dispatcher to the BlackBerry Messaging
Agent.
If the file size of the attachment content exceeds a single data packet, the BlackBerry device divides the content into
multiple data packets and sends the data packets to the
BlackBerry Messaging Agent.
Feature and Technical Overview BlackBerry Enterprise Server process flows
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