Blacklist Archives - DeliverNow

Which are the main blacklists and how to self-identify when you are already listed in?

As a regular reader of DeliverNow, you are probably familiar with the concept of blacklist. However, we consider it is important to bring light upon the importance of blacklists and their impact in the emailing field, and more importantly in the management of your deliverability.

Let’s start by brushing upon some blacklists abbreviations. The most common are RBL (Real-time Blackhole List) and DNSBL (DNS blacklist) These acronyms are used to define all the same thing: a list of IP addresses or domain names considered to perform bad emailing marketing practices, in other words: spammers.

These lists, when published — even though it is not always the case — are used by a wide range of professionals as an IP address or domain name reputation indicator. Within this major players we may find anybody aiming to run an emailing filtering system — in other words — ISP’s, entrepreneur’s system administrators, the public sector, as well as a wide range of email-filtering suite resellers.

Which are the main blacklists?

Two historic blacklists take over the arena, and they are clearly run by most of the main ISP’s in the world. These are Spamhaus and Spamcop. In the case your IP address had ended up into one of these two blacklists, it is highly imperative to perform prompt reaction in order to avoid severe and major blocking of your emailing activity.

You can check if your IP addresses are blacklisted at:

Notice that blacklists exchange data to each other. Once you have been blacklisted by Spamhaus or Spamcop, it should be no surprise to find your IP addresses blacklisted as well in many other blacklists.

Which are the main blacklists when talking about domain names?

First of all, there are two major domain-name blacklists categories. You have probably heard about lists analyzing spam-reported web site’s URI addresses — this is the first category. There is a second one referencing the whole domain names contained in an email, and more importantly in the technical header. Once again, the most reputed in this category is Spamhaus.

The two most important URI-address blacklists (enhanced with links enabling your domain name’s verification) are:

How to be removed from a blacklist?

In order to be delisted from a blacklist, the most important thing to do is trying to identify what triggered the blacklisting in the first place, for then carrying out corrective measures leading to a possible delisting demand. It is at this stage that it will be imperative to provide evidence of improvement in your Internet practice as well as an extended explanation of what got you into the blacklist at first. Notice it does not worth the effort to star this delisting process if none of the before said measures have been carried out.

Once you have successfully and utterly implemented the actions helping to prevent any further blacklisting, you might request being removed from those blacklists. Most commonly, this procedure is explained in the ‘lookup’ websites (see links below.) This procedure consists of fulfilling a formulary or sending an email. If you provide justified, detailed data, it is likely that your IP address or domain name are promptly delisted. On the other hand, providing uncertain data (precise details does not mean 10 explanatory pages) or unjustified data might end more likely in a rejection of your file or in a reply demanding further details.