Blacklists are found in thousands on the internet. Some of these blacklists are available for free while many providers buy authenticate blacklists from various legitimate internet monitoring groups. Basically, these blacklists contain ip addresses and information about emails used by spammers. IP addresses of mail services sending out spam emails will also be included in the blacklists. Simply, all kinds of blacklist sites will be available in blacklists.

ISPs and bandwidth providers will check blacklists before delivering any email. IP address of the sender is checked against blacklist used by the provider. It is not possible to find out what list is used by the ISP and bandwidth provider. Aside from public blacklists, companies will have private blacklists for more detailed checking.

Blacklist test is employed by email monitoring tools. These tools will use available known blacklists to perform the test. When your IP address is blacklisted in any of those known lists, you will be notified. Groups that are interested in keeping the internet clean will be engaged in creating these blacklists and hence, if you contact them, you can get your ip address whitelisted.

Many entrepreneurs lose their subscribers mainly because they don't check blacklists. While it is practically impossible to manually check your IP address against blacklisted list of IP addresses, a tracking tool can be of great help. If you think that you have to spend a great deal of money to buy a monitoring tool, then you are wrong. You can easily find a good email monitoring and tracking software that can help you in doing all kinds of blacklist tests.

The tool you use for checking blacklists must constantly update itself because everyday, many new domains and dns are added to the blacklists by internet users. Also, the tool must be able to use as many blacklists available to increase email deliverability.



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