IP Blacklist Check
Checks whether an IP address or domain is on the Spamhaus, Barracuda and other spam blacklists.
Enter an IP address or a domain name. For a domain, the tool checks the IP addresses of the website and the mail servers listed in its MX records.
What being listed means
The main list is Spamhaus, which most mail servers consult. If an address is listed there for spam, malware, or unwanted bulk mail, messages sent from it will be rejected. The "home or mobile internet" label is different: almost all such addresses carry it, and it only matters if you run your own mail server on one of them.
If your address is listed, fix the cause first: stop the mailing campaign, scan your computers for malware, and close the open proxy. Requesting a removal before that is pointless, as the address will end up on the list again.
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