Who is blacklisting my IP?

Web hosting providers maintain blacklists (lists of banned IP addresses). There is no central source of IP blacklists, and if your IP is on multiple blacklists your email may be stopped at any point along the internet before arriving at its destination.

It’s simple enough to do a search for who is blacklisting your IP. There are numerous search tools available to help you figure out the blockages.

Each provider has different standards for listing and delisting IP addresses. But one constant is that if you have a virus or malware on your computer, it will be actively trying to communicate with other computers and be defined as an “attack” computer, resulting in your IP address being blocked.

Other reasons for blacklisting include too large a volume of mail, or messages that have spam characteristics. If you have a DHCP IP address (a variable IP address typically used for residential connections), it may be that a computer previously associated with that IP address was a spammer, so you are blocked even though you did nothing wrong.


Related articles:

Eliminate email delivery problems caused by IP address blacklisting

MailChannels Outbound Filtering can help