Blacklist

What is a blacklist?

A blacklist contains banned emails sent by specific email addresses and domains. It is used alongside a whitelist, emails sent by specific email addresses that are considered trustworthy, to ban an email domain while allowing a few specific email addresses from the same email domain to be accepted.

If an email address or domain is considered harmful or dishonest, it can be blocked by an employee who adds the email address or domain to the blacklist. Email addresses can be unblocked to allow them back into the whitelist or remove them from the blacklist. Usually, email addresses that try to phish, pharm or spam are added to the blacklist.