Passcode Authentication Technology

Comodo AntiSpam Desktop 2005 uses an AntiSpam Passcode to authenticate people sending you email. Requests to check mail generated by the email client are intercepted by Comodo AntiSpam Desktop 2005, running on your computer. AntiSpam then retrieves mail from the server and authenticates the sender of each message. If the sender of a particular message is allowed, it is immediately passed to your inbox. If the sender of a particular message is blocked the email message is either immediately deleted or is stored in the Quarantine Database for a prescribed period of time, whichever you choose. If the sender of a particular message is unknown, the email message is temporarily stored in the Quarantine Database and a special AntiSpam Alert message is automatically sent back to the sender of that message. The AntiSpam Alert message asks the sender reply, typing your AntiSpam Passcode in the reply. The AntiSpam Passcode is sent along with the AntiSpam Alert in the form of a graphical attachment. The idea behind sending the AntiSpam Passcode as a graphical attachment is to require a human to read the passcode and then type it in the reply. When the AntiSpam Alert reply is received by AntiSpam and the passcode is found to be correct, the original email message is immediately passed to your inbox and an entry is made into an Authentication Database (ADB) allowing all subsequent email from that particular sender. If the AntiSpam Alert reply is found to contain an incorrect passcode, the process is repeated for a configurable number of authentication attempts.