Email Marketing



The Interserver blacklist is a DNS-based blacklist that lists single IP addresses or entire ranges.  If you land on the Interserver blacklist, you are guilty of sending unsolicited bulk emails caught in their spam traps. This blacklist automatically blocks IP addresses and doesn’t take reports from any other parties. Currently, the Interserver blacklist is tracking more than 1.7 million cases of possible malware. Removing yourself from the Interserver blacklist is not a big deal. It automatically deletes entries after the lapse certain time. Remember there is no other spam flag from the IP address or same range during that period. Again, you do not have the option of a manual request for you to be taken off the blacklist. Reduce your risk of getting onto the Interserver blacklist by engaging in proper email practices including:-

  • Verifying all your email addresses before you attempt any outreach
  • Avoid sending unnecessary emails
  • Avoid the use of spam words within your email drafts
  • Keep your sending volume to a minimum (30-50 a day if your inbox has been warmed up for at least 30 days)


It’s referred to as spam and open relay blocking system (SORBS) zombie blocklist and is a list of networks hijacked from their rightful owners. And in most cases there’s a change in ownership of the netblock’s ownership WHOIS information then IPs are sold to other companies that do not suspect anything. Listings to SORBS Zombie occur as single IP addresses hosting multiple domains or the entire range of IP addresses from email hosts or DNS. The impact of listing in SORBS is low deliverability. Some of the notable reasons for listing on SORBS include:-

  • Sending or relaying spam
  • Having been hacked or hijacked
  • Having trojan infestations
  • Using IP space that it does not have the right to use

Consequently, you can get off this blocklist by making a manual request to remove your IP address. Register for an account with SORBS first then lookup for IP addresses or netblocks within the SORBS database and open tickets for support. You are required to prove that your IP netblock is registered through the regional internet registry. The following are some tips for you to stay off the SORBS zombie blacklist

  • Ensuring your servers are configured properly and do not have open relays or open proxies
  • Conducting continuous security checks, and
  • Verifying your netblock or IP ownership and WHOIS information


The Konstant Blacklist refers to a list of IP addresses caught in a “honey pot spam trap.” These IP addresses are owned by cyber spammers who have specialized in sending bulk spam across the internet. Additionally, spammers can land on this blacklist if they are reported by email users. As such, the Konstant Blacklist Organization goes through the list of IP addresses manually to audit in case false positives are triggering the spam filters. Konstant Blacklist also known as RBL or Realtime blacklist is a spam-blocking list.

Consequently, the side effects of your landing on the Konstant Blacklist include increased delivery issues, slowed down campaign effectiveness, and the potential to have a permanent blocking. The user’s sender reputation is important in the issue of email campaigns. For this reason, landing on the Konstant blacklist will directly hurt you as a user and decrease your email reputation.

You can easily find out whether you are on the Konstant blacklist. If your email triggered the Konstant blacklist’s “honey pots”, it’s possible that you landed automatically on their list. Therefore, once the spam traps have been alerted of spam, the IP address concerned is added immediately to the Konstant blacklist. The organization’s team checks the list periodically to ensure there are no mistakes made by the spam traps.

To remove your IP address from the Konstant blacklist, you need to follow a simple procedure. Search for your IP in the Konstant and once you have found it on the list, request for removal on the Konstant blacklist website.

You can reduce the risk of getting onto the Konstant blacklist by engaging in proper email practices such as

  • Verifying all email addresses before you attempt any outreach
  • Avoiding sending unnecessary emails
  • Avoid the use of spam words within your email drafts, and
  • Ensuring your sending volume remains at a minimum.


The lashback blacklist is an up-to-date blacklist with over one million IP addresses already listed. The reason why this blacklist is up to date is that it’s updated automatically every single hour. It compiles IP addresses sending emails to addresses harvested from suppression files. Additionally, it’s referred to as the world’s largest intelligence database since it has been running for more than a decade now. The key focus of the Lashback blacklist is monitoring compliance with unsubscribe.

How you get on the Lashback Blacklist

If your email address is caught sending emails to Lashback’s email addresses known as unsubscribe probes, it will be listed.  You should be careful if you’re a repeat offender because you might be charged a certain fee. These fees act as an attempt to discourage bad emails that can be spread around the internet. And if you physically did not send an email to a harvested email address that landed you on this blacklist, then you could be having a security issue. Therefore, if you experience a security issue, you can immediately be delisted and relisted.

How to remove yourself from the Lashback Blacklist

Those landing on the Lashback blacklist for the first time may request to be removed for free. You may delist your IP address for free once in 30 days. There is a fee associated with the process of removal if it happens a second time. As such, Lashback blacklist requires 30 days to lapse without any incident for you to be removed from the list. To reduce the risk of getting onto the Lashback blacklist, ensure to engage in proper email practices including

  • Verifying all email addresses before you attempt outreach
  • Avoid sending unnecessary emails
  • Avoid the use of spam words within your email drafts, and
  • Keep your sending volume to a minimum (30-50 a day if your inbox has been warmed up for at least 30 days)


The NoSolicitado blocklist uses the pristine spam trap network and other techniques in identifying the potential sources of spam, phishing, and email scams. Basically, listings happen at the IP level with the impact being low deliverability. There are several reasons why your IP address can get listed in NoSolicitado blocklist including:-

  • If you buy email lists or harvest email addresses from websites.
  • If you have poor list hygiene and fail to remove unknown or invalid subscribers.
  • If you send emails from a shared IP address and either you or another company is using the shared IP address is sending spam or phishing emails.
  • If your email server has not correctly been configured.

Accordingly, you can get your IP off this blocklist by making a manual request accepted by the NoSolicitado blocklist. You should check the status of your IP and then fill out the delisting form. The recommendation is to fix the cause of your listing before you submit a delisting request or the request will be ignored. Finally, the following tips will help you stay off this blocklist

  • Confirming that your IP has FCrDNS.
  • Making sure that your servers are properly configured and have no open relays or open proxies.
  • Conducting ongoing security, virus, and malware checks on all of your servers.
  • Using a dedicated IP address.
  • Using opt-in consent for all subscribers.
  • Not buying email lists or harvesting email addresses from websites.
  • Maintaining a good list hygiene strategy and regularly removing unknown and invalid subscribers.
  • Ensuring that your Email Service Provider has policies and procedures in place to identify and remove spammers from their sending system in case you use a shared IP address.


Email security is today a big concern for most internet users. For this reason, organizations and individuals should protect their mailboxes from the huge volumes of spam as well as phishing emails that they often receive. This is what Mailspike offers. Mailspike refers to a free blacklist created from those IP addresses with a bad reputation. Many of the IP addresses blacklisted by the Mailspike can be associated with infected systems or even fraud spam servers. And when the recipient’s mailbox has been protected using Mailspike, the recipient cannot receive messages coming from the blacklisted IP addresses since they are considered illegal.

The Mailspike services according to Mailspike contain two complementary data sets

  1. Reputational Data

Reputation data is usually compiled on top of certain characteristics and over-time behaviors of IP addresses noticed as having sent a direct-to-MX email. Additionally, the reputational data compile scores that dictate the likelihood that an IP address is used in sending spam.

  • Zero-Hour Data

This is also referred to as ZBI and often lists those IP addresses seen participating in the distribution of spam waves. The zero-hour data does not consider over-time IP behaviors and instead tries to detect viral behaviors shared by at least one or more IP address clusters. An IP typically exists on the Mailspike list because of two main reasons

  • That a legitimate email account has been compromised and used in sending malware, spam, or phishing emails.
  • That a compromised server or computer is now controlled by spammers and sends spam, malware, or phishing emails.

How you can find out whether you’re Blacklisted by MailSpike

The first indication that your IP has been blacklisted by the Mailspike is that you cannot deliver emails at certain emails to recipients. A bounce error will then appear like this

"5.7.1 H:M11 [] Connection refused due to abuse. Please see or contact your E-mail provider."

Therefore, if you want to confirm whether your IP is blacklisted on the Mailspike, run your IP check on the Mailspike lookup page.

How you can Remove IP Mailspike Blacklist

Start by doing a lookup of your IP using Mailspike’s lookup form and if the IP has been blacklisted, the “Request Delist” form will appear on the results page. You can then fill out the form and send the request for delisting to Mailspike. The delisting requests are automatic and can be fulfilled one hour after you have submitted them. Now that you have known how to delist from Mailspike, there is a need to ensure you’re not blacklisted again. Ensure you have identified the root causes of blacklisting then fix them.

The common reasons why an IP Address can be listed on Mailspike

  • Sending with no permission

Emails sent without the consent of the recipient are considered spam. Seek permission from the subscriber to prevent blacklisting of your IP address by Mailspike. For a stale list, send a re-subscription campaign to re-confirm your subscribers. Thereafter, you can remove those who failed to respond from your list.

  • Irrelevant content or Misleading subject line

Misleading the recipient in order to increase conversation is wrong. An email whose content fails to respond to the expectations of the subscriber or an email whose subject line is misleading with content that offer something different will be flagged as spam. If messages come out of your IP address to produce spam reports frequently, your IP will most likely be added to the Mailspike blacklist.

  • Compromised Server

Cyber-criminals can compromise your server by getting control over it, and sending malware, spam, and phishing emails without your knowledge from your server. For this reason, you have to check your server logs to ensure they send only legitimate emails. In case you notice abnormal volumes associated with your organization, it should act as a trigger to do your investigations. There are many IP addresses that Mailspike blacklists and you could be unfortunate to find your IP address blacklisted. In essence, blacklisting is frustrating but you should not consider it a disaster because you already know the process of delisting your IP address from the Mailspike and ways of reducing the risk of getting to the list again.


Rats-Dyna blacklist’s focus is large-scale spammers. You should learn how it works and ways of reducing the risk of getting onto it. This blacklist is described as a list of IP addresses that trigger spam filters that send spam in large quantities. Rats-Dyna Blacklist also compiles IP addresses trying to send emails to invalid users. Therefore, if an IP address sends mass quantities of junk mail, RATS-Dyna blacklists spam filters and flags the user because they could be infected with viruses, malware, or Trojans.

How RATS-Dyna Blacklist Works

The RATS-Dyna blacklist works to stop the spread of unwanted spam emails across the internet. Using spam filters, they’re constantly on the lookout for viruses or malware that could potentially damage the user’s computer. The cyber-attacks can also access users’ personal and confidential information. For you to make use of the RATS-Dyna blacklist, you may not need any installation on your computer. You just need to set your RBL lookup tool for ‘’.

How to remove yourself from the RATS-Dyna Blacklist

The RATS-Dyna blacklist enables users to enter the IP address they would wish to remove and even request removal. You can only request removal if you run your own mail server. Further, you can reduce the risk of getting onto the RATS-Dyna blacklist by engaging in proper email practices such as:-

  • Verifying all email addresses before attempting outreach
  • Avoid sending unnecessary emails
  • Avoid the use of spam words within your email drafts
  • Keep your sending volume to a minimum (30-50 a day if your inbox has been warmed up with an email warmup service for at least 30 days)


The truncate blacklist compiles spam that comes from malware, IP addresses that spammers use, IP addresses used for sending bulk mail, and those who fail to comply with CAN-SPAM Act. Truncate blacklist is a virus-based blacklist, that lists individual IP addresses of email servers found guilty of sending spam mail with malware and viruses.

How Truncate Blacklist Works

The IP addresses flagged because of sending virus-infected spam can be added automatically to the Truncate blacklist. It works quickly since IP addresses are added within 10 minutes or even less if the software has detected a spamming spree. Also, it is incredibly accurate considering it’s often updated after every 10 minutes. Essentially, the truncate blacklist uses a system known as “Message Sniffer Spam and Virus Protection”. The Truncate system has an advanced learning machine that quickly builds IP address reputations. Further, it constantly monitors conversations for thousands of systems.

How to remove yourself from the Truncate Blacklist

The truncate blacklist doesn’t have an option where you can request to be removed from its database. Time is key when it comes to Truncate blacklists because IP addresses automatically expire after a lapse of a certain period and have not been flagged again. IP addresses on this blacklist are constantly monitored for activity. And if there’s no bad activity, truncate drops the IP address from the list. However, the timeline for you to be dropped doesn’t depend on the severity of the spam which landed you on its list.

How to reduce the risk of getting onto the Truncate Blacklist

Just like the other blacklists, the best way to ensure you do not get listed on this blacklist is to engage in proper email practices like:-

  • Verifying all email addresses before you attempt outreach
  • Avoid sending unnecessary emails
  • Avoid the use of spam words within your email drafts
  • Keep your sending volume to a minimum (30-50 a day if your inbox has been warmed up for at least 30 days)


Woody’s SMTP Blacklist was initially created as a personal blacklist for those IP addresses caught up in spam traps of the The main purpose of this blacklist is to ensure that spammers getting email addresses from email harvester software are stopped. This blacklist is considered a spam-based blacklist and lists individual IP addresses or even the entire range. The individual IP addresses or entire ranges are the ones responsible for sending unsolicited bulk emails.

How Woody’s SMTP Blacklist Works

Woody’s SMTP blacklist blocks spam sent by spammers through the harvester software. Spammers sending emails to are added automatically to Woody’s SMTP blacklist. To remove yourself from Woody’s SMTP blacklist, you first request for removal but first lookup for your IP address. If it appears when you search, just request to be removed. Ensure you explain the circumstances under which you were listed and the reasons you think you need to be removed. Note that IP addresses whose spam-like behavior is repeated will most likely be relisted on Woody’s SMTP blacklist. And if an IP address is relisted repeatedly, there won’t be a guarantee that it will again be removed. This blacklist keeps a repeat offender on its list for a period the organization chooses.

Reducing the Risk of Getting Listed onto Woody’s SMTP Blacklist

You can avoid being listed on this blacklist by engaging in proper email practices for example:-

  • Verifying all your email addresses before attempting outreach
  • Avoid sending unnecessary emails
  • Avoid the use of spam words within your email drafts
  • Keep your sending volume to a minimum (30-50 a day if your inbox has been warmed up with us for at least 30 days) What Is The ZapBL Blacklist?


An IP domain name or address is listed if the administrator receives spam messages from them. Such listings are created manually through administrators and ZapBL takes recommendations from its own administrators only. Essentially, they cannot allow 3rd outside party opinions. Administrators of this blacklist are confidential and could be released under various circumstances.

The majority of the listings on ZapBL blacklists expire after some time but administrators may flag some IP addresses and domains in order to prolong the listing time. Additionally, they can flag certain domains and IP addresses to ensure they do not come off the public blacklists. IP addresses may also be delisted using a lookup tool. In case you fail to spot an expiration date or you’re not offered the option of requesting delisting, contact ZapBL Blacklist Organization for more details.


WBPL is a private blocklist that consists of IP addresses that connect to the member’s systems and can deliver unsolicited bulk emails or spam. This list is designed as the most effective if used by WPBL members, but it may not suit other users. WPBL is not used for blocking SMTP connections outright. It’s considered more effective when scoring systems such as SpamAssassin.

Additionally, WPBL has a history of reliable operations running since 2004 and exhibits a rather good detection rate currently with some low false positives. The current accuracy statistics can be found in Intra2net and UCEPROTECT.

For WPBL:-

  • Only individual IP addresses connecting to the blocklist are listed and not the entire network.
  • The public may not be able to report spam because there are no manual additions. WPBL network can detect all spam passively.
  • All entries in this blacklist are temporary and can expire with time.
  • Any IP address is removable by anyone through the blocklist lookup facility.
  • Hosts in WPBL are not taken as spammers and it does not mean there are those running a spamming business. Mostly, sites are listed after they are infected by viruses or compromised by intruders. Again, most spam is sent with no consent or knowledge of site admins. Spam can be eliminated if you secure your hosts and fix the configurations.

WPBL is known to detect considerable spam amounts daily and the thresholds of being listed are significantly low. Thus, emails should not be blocked simply because an IP address is on the WPBL list. If you want an appropriate blocklist for mail rejection with few false positives, you need to consider Spamhaus Zen.

How to Query WPBL

The DNSBL is queried under the and can return if such an IP is listed in the WPBL database as another source of spam. Perform a test through a DNS query particularly for the dummy record, Further, you use WPBL subject to the set conditions but the service is not for commercial purposes and can be terminated at any time.

Removal of IPS

IP addresses are removed from WPBL automatically with the time when spam stops arriving. For instance, a lone spam sighting gets an IP listing for 7 days. Additionally, you can remove your IP address via a Lookup facility located at the top of the page. The no-questions-asked, instant removal facility has been provided for the benefit of WPBL administrators feeling the record is erroneous or have managed to fix the security issue that allowed spam through their hosts. Consequently, access to the removal facility can be restricted if it’s realized there’s an abuse of the system and attempts to automate the removal of multiple IPs through scripts. The removed records will remain in the backups of the WPBL database.


The Uceprotectl1 blacklist detects emails with an open relay on their servers or has a reverse-DNS problem causing your IP address to be identified as spam. This is a dynamic-based blacklist maintaining a list of DHCP (Dynamic Host Configuration Protocol) ranges from the internet service providers. The Uceprotectl1 blacklist usually lists both single IP addresses as well as entire ranges found guilty of spam-like activities.

How you can get on the Uceprotectl1 Blacklist

Your IP address might have been reported as a spam source if you recently sent out high volumes of UBE or unsolicited bulk emails.  For this reason, you are already blacklisted because the Uceprotectl1 blacklist used spam filters to identify your mass emails as spam activities. And if that was the case, you have to take a 7-day break for you to be delisted.

How to remove yourself from the Uceprotectl1 Blacklist

The Uceprotectl1 blacklist does not have an option for the user to make a manual request for delisting. Instead, your IP address expires automatically within 7 days if no more spam is detected. Continuous spam activity means you will remain on the Uceprotectl1 blacklist. The Uceprotectl1 blacklist allows users to make donations to an organization in order to speed up the removal process. Further, if you consider yourself innocent, consider checking your computer for any malware infections. There could be viruses that have entered your network and sent spam on your behalf, hence causing your IP address to land on the Uceprotectl1 blacklist. To reduce your risk of getting onto the Uceprotectl1 blacklist, engage in proper email practices for example:-

  • Verifying all your email addresses before you attempt outreach.
  • Avoid sending unnecessary emails.
  • Avoid the use of spam words within your email drafts.
  • Keep your sending volume to a minimum (30-50 a day if your inbox has been warmed up for at least 30 days).


This is a blacklist that flags IP addresses that send spam in the Finnish language. The Suomispam reputation blacklist refers to a spam-based blacklist, which means single IP addresses or entire ranges could land you on the list. Some examples of spam messages could be malware-filled emails or unsolicited bulk emails. This blacklist is considered unique since it does not block spam automatically. Simply, it provides a list of IP addresses that are guilty of sending spam in the Finnish language. It publishes information and allows members of the public to do what they please with it. There are four categories of Suomispam reputation blacklist including:-

  • Spam source
  • Spamvertized site
  • Escalation
  • Suspicious

Spam sources can be listed because of sending unsolicited bulk emails or emails containing spam. Spamvertised sites outsource spamming campaigns to others and as a consequence, the Suomispam reputation blacklist lists the sender, redirectors, and target sites. Further, the Suomispam reputation blacklist uses escalation when spam volume and activity are high. This blacklist uses suspicion tactics whenever there’s a reason to believe that networks send spam campaigns. Various tactics often alert the blacklist about the network they keep on their own radar.

How to remove yourself from the Suomispam Reputation Blacklist

It’s not an accomplishment to be featured in the Suomispam reputation blacklist. It means you have been caught sending malware, spam, and cyber-attacks from an IP address. Check your IP address to confirm any listing.

Delist Request

To request for delisting, plead your case fully with explanations and details because the Suomispan reputation blacklist does not look at your case if not explained entirely.

Whitelist Request

This blacklist does not have a whitelist. The chance for removal is small if your entire work has been listed. You may need to wait until the spammer moves onto another network before you correct the issue.

Request to list Domain

Users request that their domains be delisted if the reason for listing does not apply to them anymore. This blacklist recommends users check their site to confirm the domain is listed before requesting removal.

Finally, you can avoid getting listed on the Suomispam reputation blacklist by engaging in proper email practices such as:-

  • Verifying all your email addresses before attempting outreach
  • Avoid sending unnecessary emails
  • Avoid the use of spam words within your email drafts
  • Keep your sending volume to a minimum

Other blacklists that you can check include

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