Definition: A blacklist is a list of addresses, typically IP addresses, but could also pertain to email addresses among other things, which is rejected or denied access by default. A blacklist of IP addresses known to distribute spam is often used to ban any incoming email from those addresses as a means of combating spam.


About Author

I have a passion for technology and gadgets--with a focus on Microsoft and security--and a desire to help others understand how technology can affect or improve their lives. I also love spending time with my wife, 7 kids, 3 dogs, 4 cats, 3 rabbits, 2 ferrets, pot-bellied pig and sulcata tortoise, and I like to think I enjoy reading and golf even though I never find time for either. You can contact me directly at For more from me, you can follow me on Twitter, Facebook, Instagram and LinkedIn.

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