Frequently Asked Question

Email Blacklisting
Last Updated 3 years ago

So, for many years now blacklists have been used to identify mail hosts that are responsible for either routing, or originating spam. By using blacklists we can significantly reduce spam. Over the years blacklists have come and gone, but a few good ones remained and we take advantage of these and donate time and financially support for the benefit of the community as a whole.

There are two types of email blacklist;

Automated - These use honeypots and other sourced to automaticaly measure and blacklist IP Addresses (and in some cases sender domains). These automated systems usually expire entries every 24 or 48 hours and then re-list if spam continues. Whilst some of these blacklists have ISP programmes where our mail servers can be omitted, there is often no way to manually be removed from the list, save for expiry.

Maintained - These use manual submissions from mail admins and sys admins, who take their own time to submit spam reports. These blacklists often list for a week or more and some indefinitely. To be removed, you need to make an application to the blacklist which is a simple process.

In our mail gateways, we check every originating IP address in a set of 12 blacklists before accepting email, which whilst costly, significantly reduces the level of spam our customers receive.

If your email is being rejected, then you can check your listing in any number of online tools, and we have a blacklist diagnostic tool FREE to use on our support site available HERE.

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