Blacklisting is done by email servers and spam filters to help curb mass emailing and SPAM communications. These web hosting companies sometimes block an entire IP range if an address is labeled a SPAMMER. And if you’re in the same range, you get blocked as well.
Using our blacklist checker tool will allow you to verify your status with over 300 IP blacklists. And if anything is wrong, you’ll know who to contact about having your IP removed from the blacklist. Don’t forget to check BOTH your IP address and domain.