Also known as: Blacklist
The more inclusive term for a blacklist, or a list of senders that have run afoul of spam filters. Typically flagging senders by IP address, preventing messages from being delivered to recipients. Bad to be on.
- The 101 on Email Blacklists in Plain English, Omnisend
- MXToolBox Blacklist Check, MXToolBox
- Email Blacklist: How to Check and What to Do If You’re Blacklisted, Clean Email