An SMTP Service Directory Reader
The author writes "You know all those email you send using CDO or CDONTS? What happens to the ones that are addressed wrong or if the sender or recipient's address isn't even formatted correctly? This script will let you take a peek at the messages in the mailroot folders. This includes the ones that the SMTP service hasn't delivered yet and even those it's already given up on so you can see what's happening." Source code for the SMTP reader available for download.