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.

Absolute Must Have Setup

I assume you already have for your outgoing mail server ALL the following:

- forward and reverse (A and PTR) DNS entries point to the same name

- reasonable EHLO/HELO from your server

- SPF implemented

- closed relay, ALL outgoing emails are coming from authenticated users only

- monitoring in place, at any stage you know what happens on the server (especially the size of the queues, any bounce backs)

- ALL outgoing emails filtered through Anti-Spam.

- abuse@ and postmaster@ are valid email addresses and are being monitored


In addition it is highly recommended to implement the following:

- DKIM (DomainKeys Identified Mail) with it's DNS entry

- DMARC (Domain-based Message Authentication, Reporting & Conformance)


If you need help with anything from the above list you can always contact me at This email address is being protected from spambots. You need JavaScript enabled to view it.