Server Level Antispam Options (Black Lists)

You can separate DNS black lists into two categories: standard DNS Black Lists and trusted DNS Black Lists. A trusted DNS black list is one that you know is updated frequently, and is more likely to be accurate. You may also identify a black list as trusted because you find that for your uses it produces the least number of false positives. If a message matches one of these black lists, it is automatically deleted.

A standard DNS black list is a black list of which you are uncertain about its accuracy. If a message matches one of these lists, an X-Header is inserted into the message, indicating which black list it matched.

Related Topics

How Black Lists Work

Understanding DNS Black Lists

Server Level DNS Black Lists