Microsoft Office Tutorials and References
In Depth Information
Email handling and transport
Email handling and transport
Email transport is the end-to-end path of email transmission. Email transport is the
responsibility of the Hub Transport server role in Exchange Online as well as FOPE. Email transport
can be categorized into three communication types:
Communication between clients and Exchange Online
Communication between Exchange Online and destination email servers
Communication between Exchange Online customers
Communication between clients and Exchange Online
Exchange Online encrypts all email communications between the client and Office 365.
Users can access Exchange Online through the following ways:
A web browser
Outlook rich email client application
Mobile communication devices such as smartphones
iPads, tablets, and other mobile computing devices
Blackberries, a proprietary form of communication device
Regardless of which device is used to connect to Exchange Online, Exchange Online is
designed to ensure that the connections are all secured at the transport layer, as shown in
Figure 10-1.
Outlook uses Remote Procedure Call (RPC) over an encrypted HTTPS channel to access
email messages. HTTPS is the transport layer security that encrypts the communication
If a browser is used, the OWA client is served by Exchange Online through HTTPS as well.
Exchange ActiveSync (EAS) is an Extensible Markup Language (XML)-based communication
standard that is communicated through HTTP or HTTPS. The Exchange Online
implementation of EAS is based on HTTPS, so the communication channel is also encrypted in this
If the mobile device does not have a client that can consume EAS, at the very least it would
have a browser that can access OWA or OWA Light over HTTPS. Therefore, the
communication channel is encrypted.
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