Microsoft Office Tutorials and References
In Depth Information
Email handling and transport
Figure 10-1 Client connections to Exchange Online
For Blackberry devices, Microsoft and Blackberry, formerly Research In Motion (RIM), have
partnered to offer the Blackberry Internet Service (BIS) as a free service for Office 365
customers. Communication between Blackberry devices and Office 365 through BIS is
encrypted.
Communication between Exchange Online and destination email servers
The only time that email might not be encrypted during transmission is the
communication portion between Office 365 and the destination email system hosting the mailbox of
the recipient, as shown in Figure 10-2. This is the Simple Mail Transmission Protocol (SMTP)
portion and is not new in the world of email, which is the reason why email is generally not
considered a secure method of transmitting information.
Figure 10-2 Unsecure SMTP traffic
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