Being listed in means that your IP address is identified to be a spam source. blacklist refers to a collection of classification or reputation databases for IP addresses. As such, listing via this blacklist consist of spam reports through volunteers or direct spam trap hits. By design, neither blocks emails nor does it operate a database with personal information. It offers a list of those IP addresses or domains considered as the probable source of spam. Again, operators of the email servers may use or may not use such details in classifying or blocking actual messages.

Many businesses today must deliver messages to a wide audience in the most convenient way and at a reasonable price. The cheapest way of doing this is through emails. Emails can help reach millions of people such as clients, subscribers, students, and potential clients. Many businesses depend on bulk emails and newsletters sent to their mailbox users and disruption of such emails can prove costly to any business.

However, disruptions occur and there are various reasons why it can happen, the most common being a block by a program associated with the target mailbox. The programs have been designed to protect or shield mailboxes from receipt of emails from sources reputed for sending spam mail or such mail that behaves like spam. Examples of the programs include Spamhaus, 0spam, and blocks mails and ensures they do not reach their targets for suspicion that it’s spam mail or behaves like spam mail. Further, runs a list that stores domains and IPs established as abusing email delivery services. The list if desired can be programmed to block hitch-free deliveries.

How Does Work is a database that stores domains and IP’s reputation value that delivers mail. It doesn’t necessarily block emails but provides mailbox service users and providers IP domains and address list it considers more probable sources of spam. Hence, the decision on whether or not to use the information to block mail rest with server operators and email service providers.

Additionally, depends on the obscure emails only known to the organization in identifying spam sources. The obscure emails are known as spam traps-email addresses created by the organization such as and Spamhaus to lure spam. Also, emails addressed are not for communication but are typically published in a way that they cannot invite emails from legitimate sources. They are hidden for discovery discovered by the automated email address harvesters that spammers mostly use. Upon discovery by spammers, they start receiving mail sooner or later. And as per policy, such emails are unsolicited and are classified as spam.

What Happens after Spam Gets into One of’s Spamtraps?

After spam gets’s spam traps, the domain or source IP address name is added to one of their lists in real-time. Realtime lists published by are in two main categories based on the domain name and IP addresses. Additionally, two lists are often published under the IP address list and list. The displays IP addresses sending spam while is used for the residential IPs committing the same offense. Consequently, the domain category has two lists, which displays a spamvertized domain, and which displays a spam-sending domain. and Block Mails has not been designed as a system that blocks mail but is used to block mail through configuring the email server in order to take actions based on the response codes or DNS listings.

Below is an example of a simple code for doing an IP verification or rejecting emails from sources linked to or listings

smtpd_recipient_restrictions =






For this example, is being used in blocking emails with and listings. And if the intention is blocking email messages based on response codes, the following example is a code that can do it.

smtpd_recipient_restrictions =





The above example shows that emails from the listed IPs at (code and will be rejected but not the ones from the network (code

What causes a domain/IP listing on

It can happen if a message is captured in spam traps set by In cases where there’s a shared host, there may be a warning on cutting off sources of spam before any listing happens. Secondly, if the operator is reputable for supporting spam, their domain or IP could be listed. Thirdly, IP addresses that appear related to likely sources of similar spam could be listed. Finally, spamvertized domains and IPs will be listed.

Delisting from

The following steps can be used to delist from

First, you need to ensure all the spam flow has been stopped

Ensure support services, for instance, web hosting for spammers have been stopped. If it is not done, it might delay the delisting.

Again, might ask for evidence that all spam even from supported IPs has been stopped.

In the process, you might be required to send a confirmation message as a way of verifying your address.

If all this is done, you’re closer to being delisted from

So what next after Delisting

Knowledge about delisting from does not in any way guarantee you a pass of using your mail server the way you please. In essence, repeat offending can give you a bad reputation, hence arbitrary listings. Ensure to take the following steps that will ensure you avoid any future listings.

Do not send spam

If you run emailing service or a newsletter, ensure you have verified that your target users have been confirmed active.

In case you have to provide email services to unverified users, ensure to limit the number to 200 a day. This prevents listing and abuse.

Before you send any emails, scan your servers and computers for malware.

Engage a professional who would maintain your systems to avoid any future technical issues that make your IP address and domain behave like it has malware.


If you’re listed in the, it means that your IP address has been identified as one of the spam sources. Listings via blacklist consists of spam reports availed by volunteers and other direct spam trap hits. This blacklist has not been designed to block email or operate a database of personal information. Most businesses are depended on bulk emails or newsletters sent through their mailbox users. This means any disruption to such mail can be a costly affair. Again, has to rely on obscure emails known to the organization only in efforts to identify spam sources. These obscure emails known as spam traps have a significant role in luring spam. Essentially, spam traps are just email addresses not for communication but typically published in a way that they cannot invite emails from legitimate sources. They are hidden to typically be discovered by automated email address harvesters, used often by spammers. If an IP or domain is listed, it’s possible to delist by ensuring all spam flows have been stopped, ensuring support services have been stopped, stopping all spams from supporting IPs, and sending confirmation messages to verify addresses.

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