Does 10 minute mail really work?

"The purpose of 10 Minute Mail is to limit the amount of spam a 10 Minute Mail user would receive on their own email address. If a regular email address is used to validate with other sites, these sites can use the regular email to send spam mail to. By using 10 Minute Mail, a temporary email is used and it will not be available after a short while and therefore will not receive the spam that would be sent to a regular email account."