is a free service to check if your IP address is blacklisted, a common cause of email delivery issues. Only a small number of blacklists affect your email delivery. With, you can find out if you're on any of the blacklists most relevant to Ireland.

What is an IP address?

An IP address (Internet Protocol address) is a unique address that computers and other devices use in order to identify and communicate with each other on a computer network. An IP address simply identifies a specific computer on a network. More FAQs...

About IE Internet

IE is a leading Irish technology company that provides managed email and application hosting services for business. is a service we have developed with the needs of our customers in mind.

Q. What is a blacklist?


A. A blacklist is a database containing internet addresses (or IP addresses) used by individuals or companies sending spam.

Blacklists are created and managed by anti-spam organisations and are seen as an effective way of punishing known spammers.

Some of the most widely checked blacklists are Spamcop, MAPS blacklist, and SPAMHaus - checks against these and many more. These organisations publish blacklists of IP addresses that are known spammers. Blacklists are used by thousands of ISPs as part of their defense against spam. A legitimate email system can also end up being blacklisted, resulting in mail delivery problems and subsequent costs for business.

Internet Service Providers (ISPs)  subscribe to blacklists in order to filter out spam sent across their network or to their subscribers. If you are listed and an ISP checks against the list, your message will not be delivered.


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