Blacklist

Generally, a blacklist is a list of unaccepted or forbidden items or persons. In the virtual world, it is a technique that enables the acceptance of messages from all users who are not present on such a list.

In newer terminology, a blacklist is also referred to as a blocklist or denylist.

There are two types of blacklist: Those created by users within their Antispam application, and professional, regularly updated blacklists which are created by specialized institutions and can be found on the internet.

Blacklists are essential for blocking spam, but they are difficult to maintain because new items to block appear every day. We recommend using both a whitelist and a blacklist to filter spam most effectively.