This from my ISSW colleague, Alasdhair Buchanan: -
Starting with WebSphere Message Broker V7, the EmailInput node has enabled you to provide input to a message flow via an e-mail, and the functionality remains the same in IBM Integration Bus V9. This article provides a simple example with the e-mail consisting of either text or a single attachment, and describes possible issues when you are processing more complex e-mail messages. It also shows you how to configure IBM Integration Bus to use the EmailInput node.