Whitelists are often used in email. Whitelists are basically an acceptable list of people that it is okay to receive email from. To become blacklisted is to not be allowed to send an email to a specific recipient. In internet terminology, whitelists is a list of email addresses that are spam free. Whitelists are most commonly used by people who want to create a list of people that they can receive email from. As a verb, it means to place a person on a list of acceptable email senders. Whitelisting is very easy to do and can save email users a lot of time and storage space. Whitelisting allows email users to say goodbye to spam emails forever.