Manual:$wgDnsBlacklistUrls/en

Details
Sets a list of DNS blacklists to use, if  is set to. This replaced.

Changes in 1.19
Array values can either be a string containing the URL of the DNS blacklist, or an array containing the URL of the blacklist and an associated "key" should the blacklist require one.


 * Example


 * or

You can find Spam databases on https://www.dnsbl.info/ or others similar websites.