Electronic mail, or email, allows for sharing of information across the Internet through email addresses. Validating email addresses is important for companies to market to potential customers or clean up subscribed email lists. Websites can check if a single email address is taken, but validating a large list is time-consuming. Software is available that allows huge searches of valid email addresses within a single window, making it faster to validate long lists. It checks potential addresses, excludes similar addresses like "[email protected]", and displays the valid addresses.