Signing up for a site or service that requires your email id to send a validation email but you are not sure if they will sell you email address to spammers. How about having a temporary email id having a life of just 10 minutes!
10 Minute Mail is a disposable email address service that provides you a randomly generated email address that expires in 10 minutes. Time period can be extended if required. The interface is simple just copy the randomly provided email address and use it anywhere you want, any email coming to that id will be shown on the 10minutemail website itself. You can even reply to the emails. There is no registration required and it is Free to use.