This document describes several email services including:
1) Password protected emails that require a password to open and can send confidential documents.
2) Self-destructing emails that delete themselves after being read within 10 seconds.
3) Disposable emails that allow sending emails without giving out a personal email address to avoid spam.
4) Anonymous emails that allow sending emails without revealing the identity of the sender.
5) Email bombers that allow sending one email to thousands of recipients or thousands of emails to one recipient.
6) Email trackers that notify the sender when an email is read to verify if a message was received.