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.
PGP (Pretty Good Privacy) is an encryption program used for secure transmission of files and e-mails. This article describes the concepts of PGP, the installation and configuration of PGP Command Line, and the generation of PGP-encrypted e-mails using ASP.
Here is an interesting article that explains how to help the authorities in tracking down people who cause sites to send unwanted email to others by subscribing them to one's newsletter or applying for site membership.