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One of the new features in ColdFusion 9 was inspired (I think so anyway) by my SpoolMail project. If you go to the mail settings in your ColdFusion 9 Administrator, you will see:
This brings you to a new page that allows you to browse email sitting in the undelivered folder. This is a great tool for checking emails sent out by ColdFusion on a development machine, which are normally not set to talk to a real mail server. Click the thumb for an example of the UI: