The Spamhaus Project tracks the internet’s spam senders and spam services and makes available blocklists (free for low usage) to filter your e-mail. Before you set your e-mail servers to use Spamhouse’s blocklists, be sure to check their usage terms to see if you qualify for free use. If you think your IP might actually be on their blocked list, you can check your IP and get info on how to be removed. For a list of the 10 worst ISPs that knowingly cater to spammers, or do nothing to prevent spam, click here.

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