Changing how the BlackBerry Messaging
Agent reconciles attachments to the
messaging server
The BlackBerry Messaging Agent receives message attachments from supported BlackBerry devices and reconciles the
attachments to the messaging server. The BlackBerry Attachment Service does not convert the attachments.
The entries in the CMIME service book on BlackBerry devices indicate whether the BlackBerry Enterprise Server supports
attachments that users send from their BlackBerry devices. Users must have BlackBerry Desktop Software version 4.2 or
later installed on their computers to make sure that these service book entries remain on their BlackBerry devices during
service book updates over a physical connection to a computer that is running the BlackBerry Desktop Software.
By default, the BlackBerry Messaging Agent limits the file size of attachments that it can receive from a BlackBerry device
to a maximum of 3 MB. If the BlackBerry Messaging Agent receives more than one attachment at a time, it limits the total
file size of all of the attachments to a maximum of 5 MB.
Data that a BlackBerry device and the messaging server send each other over the wireless network must be in packets that
are no larger than 64 KB. If a BlackBerry device sends an attachment that is larger than a single packet, the BlackBerry
device divides the attachment into multiple packets. The BlackBerry Messaging Agent caches all of the packets and sends
the attachment to the messaging server after it receives the last packet.
You can optimize the amount of memory and the number of transactions that the BlackBerry Messaging Agent uses when
it receives attachments by changing the maximum file size of attachments or preventing users from sending large
attachments.
Users with BlackBerry devices that are running BlackBerry Device Software version 4.5 or later can download attachments
in any native format to their BlackBerry devices. Users can open and make changes to native file formats using an
appropriate third-party application on their BlackBerry devices. Users might be able to open specific file formats using the
media application on their BlackBerry devices.
To manage network resources in your organization's environment, you can change the maximum file size of attachments
that users can download to their BlackBerry devices.
Change the maximum file size for attachments that
users can send
By default, the maximum file size of a single attachment that users can send is 3072 KB, and the maximum file size of
multiple attachments that BlackBerry devices can send in a single email message is 5120 KB.
Administration Guide
Managing your organization's messaging environment and attachment support
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