Blacklist

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

There are two types of blacklists: 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.

It is essential to use blacklists to block spam successfully, but they are difficult to maintain because new items to be blocked appear every day. We recommend that you use both a whitelist and a blacklist to most effectively filter spam.