The spam block list checker queries a number of spam list servers, and determine whether an IP address that you specify is listed in a spammer list.

IP Address:

With ever growing number of email spams, there are a number of anti-spam projects born to combat spams. The goal of spam block list is to publicise the list of spammer and compromised hosts so that ever-increasing flow of spams through those hosts can be minimized.

Spam is known as flooding the Internet with unwanted messages, mostly commercial advertisement posted on public forums, usenet or sent through email systems (junk mail). Generally, spam is defined as unsolicited commercial email (UCE) or unsolicited bulk email (UBE). Unsolicited email that is not commercial or bulk is generally not treated as a spam. If a long-lost high school classmate finds your email address and sends you an email, this could hardly be called spam even though it's unsolicited.

There are a number of block lists, each providing a list of specific spammer lists. DNSBL (DNS-based Blackhole List) also known as RBL (Real-time Blackhole List) publishes a list of IP addresses that can be queried by software on the Internet. The technology is built on the DNS, and most mail transport agents can be configured to reject or flag messages which have been sent from a host listed on the list. SORBS (Spam and Open Relay Blocking System) is one of the DNSBL, and it publishes known spammer proxy and open relay servers.