$wgEnableDnsBlacklist = true;
$wgDnsBlacklistUrls = array( 'proxies.dnsbl.sorbs.net.', 'opm.tornevall.org.', 'xbl.spamhaus.org.', 'dnsbl-3.uceprotect.net.' );
$wgEnableDnsBlacklist = true;
$wgDnsBlacklistUrls = array( 'proxies.dnsbl.sorbs.net.', 'opm.tornevall.org.', 'xbl.spamhaus.org.', 'dnsbl-3.uceprotect.net.' );