Blacklists, Blocklists, DNSBL's, and survival: How to survive as a ...

RBL servers
DNS-based Blocklists (DNSBLs) such as the Spamhaus XBL are designed only for use on mail servers.
failure to execute an unsubscribe request,
- the CBL (Composite Block List) from cbl.abuseat.org
- the NJABL (Not Just Another Bogus List) Open Proxy IPs list from www.njabl.org.
<a href="http://www.spamhaus.org/" target="_blank">Spamhaus Advisory</a>

<a href="http://www.bbb.org/us/Find-Business-Reviews/" target="_blank">Better Business Bureau (BBB)</a>
<a href="http://www.siteadvisor.com/" target="_blank">McAfee SiteAdvisor.com</a>