The Challenge of Challenge - Response Systems

Challenge Response ("C/R") is a spam filtering mechanism. When email is received from an unknown sender a "challenge" is sent back to the sender asking them to confirm, by return email or web page, that the email is valid. The theory is that spammers will not respond.

C/R is a terrible idea. Spammers generally use the email addresses of others as the "sender." Therefore, the majority of challenges will be sent to people who are unrelated to the email being challenged. Furthermore, the spammer might use the same sender address on millions of emails which could result with that individual being inundated with challenges. This is a form of spam. It is simply abusive to counter spam by shifting the burdon to others.

TQMcube will not respond to C/R challenges.