Transport agents in Exchange
Exchange 2013 provides a library of classes that support the extension of the Exchange transport behavior and enable the reading, writing, and converting of content types. You can use these classes to create Exchange transport applications that read, write, and process messages in the transport pipeline.
What you need to know about transport agents
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||Transport agents are available in versions of Exchange starting with Exchange 2007. Transport agents are not supported in Office 365 or Exchange Online.
||Transport agents run on the Exchange server and do not support remote usage.
||You can use any .NET Framework language to work with transport agents.
|Available test and debug tools
||Use versions of Visual Studio starting with Visual Studio 2012 to debug transport agents.
||You can install transport agent applications by using an Exchange Management Shell script.