e-mail addresses are private information. If you've subscribed to a bug report in Launchpad, and someone replies to that bug, you'll get that person's e-mail address. Large bug reports with a lot of subscribers and replying persons might feed spambots.
Ever since I told my friends & classmates about free Ubuntu Disks....They are on a mission. They keep making new launchpad accounts & keep requesting CD's for them. This costs canonical too much. I'm sure there must be thousands of irresponsible people like this.
Please detect duplicate addresses in launchpad accounts & send only one disk to one address.