MBF Knowledge Base

I would like to check a list of IP addresses to see if they are blacklisted so I can block them on my mail server. Where can I check them?

There are many services you can use on the internet to check IPs for blacklist activity. Here are a few:

Who Is This IP's Blacklist Checker Tool

Project Honey Pot


Webtool's IP Blacklist Checker Tool

DNSStuff's Spam Blacklist Lookup Tool