How To Remove Your Email From Blacklists (2026 Update)

What is an email blacklist, and how does it work?

An email blacklist is a real-time list of IP addresses, emails, and domain names that have been flagged as a source of spam messages. Internet service providers, email service providers, and organizations use blacklists to minimize the number of unsolicited emails sent to users before they reach users’ inboxes. If your IP address or domain gets added to a blacklist, your emails are more likely to be rejected, end up in spam, or be blocked. 

Usually blaclists affects phishing, malware, and spam messages. At the same time, they can harm legitimate businesses if they’re not careful.

Email blacklists work by:

• Monitoring spam complaints and suspicious sending behavior.
• Comparing incoming email against known blacklisted IPs or domains.
• Taking action (like filtering, flagging, blocking) based on blacklist status.

DNSBLs, RBLs, and other types of blacklists

There are two main types of email blacklists: 

• Domain Name System-based Blacklists (DNSBLs). These use the Domain Name System to identify IPs linked to spam. The mail server receives email and queries DNSBLs to check if the sender is listed. If yes, the message may be flagged or rejected. 
• Real-Time Blackhole Lists (RBLs). RBLs also list IPs known to send spam, often based on spam traps or reports. DNSBLs and RBLs are usually used interchangeably by modern systems. 

Some of the well-known blacklists include Spam and Open Relay Blocking System (SORBS), Spamhaus Block List (SBL), and Barracuda, to name a few. 

Who creates and maintains blacklists

Blacklists are typically created and maintained by:

• Anti-spam organizations 
• Internet service providers 
• Email hosting providers 
• Private security companies that offer filtering services to other businesses

Organizations and providers typically collect this data with spam traps, user spam complaints, or sending behaviour (for example, high sending volume and poor engagement). Each blacklist has its own criteria, update frequency, and delisting process. Some are public and free to check; others are private or require a subscription.

How blacklists affect your email deliverability

Blacklists can severely damage your email deliverability — the ability of your emails to reach inboxes. Here’s how it affects you:

• Emails can be blocked by providers.
• Messages may land in the spam/junk folder, decreasing open rates and ROI.
• Sender reputation might take a hit, so future campaigns will be harder to deliver.
• Bounce rates can spike, and unsubscribe/complaint rates may rise if users distrust your emails.

Even if you’re not a spammer, a few missteps can get you blacklisted. Let’s review what can land you there next. 

Why you might be blacklisted

Here is a quick overview of reasons why you might be blacklisted:

• You send emails to invalid or bought lists. Low engagement and deliverability rates affect how email service providers perceive you.
• You have high bounce rates or spam complaints. Too many complaints can get you blacklisted.
• You use poor sending practices. Suspicious content (for example, with too many mistakes, typos, or poorly written subject lines) or rare contact list clean-up might seem suspicious and set off spam traps.
• You didn’t authenticate the sender’s identification properly. This can be a result of a technical error or subdomain warm-up gone wrong. 

Let’s go over this list of reasons for email blacklisting in full detail:

Sending emails to invalid or bought lists

One of the most common reasons why businesses get blacklisted is the purchase or use of a purchased contact list. This is a huge no-no in email marketing, as it almost always guarantees that you will end up on a blacklist. 

When you purchase or rent a list, you have no idea who those email addresses belong to or whether the owners of these emails would actually want to receive your emails. This often leads to a high number of spam complaints, which blacklist providers take very seriously. This is why it is recommended to build an email list on your own, organically. It’s a slower but much safer method.

High bounce rates or spam complaints

A bounce rate is the percentage of emails that couldn’t be delivered from the total number of emails you sent. High bounce rates signify that your audience is not interested in what you offer them. There are plenty of reasons for it: from an outdated contact list to irrelevant content. Email service providers and other entities usually take notice of this.  

Even worse are spam complaints, when recipients mark your emails as junk. Again, the reasons are plenty: 

• Your subscribers might forget they signed up. 
• Emails are sent too frequently.
• Your content quality is low content is too pushy. 

If complaints exceed safe thresholds, it hurts your sender reputation — and blacklisting becomes likely.

Poor sending practices or suspicious content

How you send emails matters. Here is what might seem suspicious and get you blacklisted:

• Lack of engagement (low open and click rates)
• Using subject lines or spammy language (like “FREE!!!” or “100% guaranteed”)
• Sudden spikes in the volume of emails you sent without warming up your domain
• Broken or suspicious links (for example, shorteners hiding the final destination)
• Attachments from unknown senders
• Malware or phishing-like behavior

Missing or misconfigured SPF, DKIM, or DMARC

These three are technical protocols for email authentication:

• SPF (Sender Policy Framework): Specifies which IPs can send emails for your domain.
• DKIM (DomainKeys Identified Mail): Adds a digital signature to verify the email came from your domain.
• DMARC (Domain-based Message Authentication, Reporting, and Conformance): Tells receivers what to do with unauthenticated emails (e.g., reject or quarantine).

If these are missing, set up incorrectly, or in conflict with each other, your emails may be treated as suspicious, especially by large providers like Gmail and Yahoo. As any email marketer will tell you, you need to check all of those protocols twice (or more) to make sure it is set up correctly — the problem is a common one!

Signs of being blacklisted

If you’re experiencing any of the below, it may mean that your domain or IP address has been added to an email blacklist:

• Delivery failures and bounce messages. For example, your emails fail consistently when sent to certain domains or recipients. You also might receive messages or notifications from your ESP that your email was “blacklisted,” “blocked for spam,” or declined based on “reputation issue.” A pattern of hard bounces across multiple providers can indicate that your IP or domain is on one or multiple blacklists.
• Drop in open rates and engagement. If you notice a sudden drop in open rates without major changes on your side — this might be a blacklisting sign. Same goes for engagement (clicks, replies, conversions): if you encounter significantly lower numbers, your emails probably ended up in a spam folder or worse. 
• Alerts from your ESP or reputation tools. Your email service provider can flag suspicious activity, spam complaints, or delivery issues tied to blacklist problems, and let you know about it. You can also check your sender reputation with tools like Validity’s Sender Score or others — if your domain is flagged as “low trust”, you are in trouble.
• Positive hits on email blacklist checkers tools. Look through checkers and tools like MxToolbox, DNSBL.info, DNS Checker, Sitechecker, Site24x7, and BlacklistMaster. If you have a “listed” status on any of them — this is a confirmation. Some are worse than others, though, and more influential.

Can you remove your email from a blacklist?

Yes, it is possible to remove your email (IP, domain) from a blacklist, but it does take time. 

First, you need to understand delisting requirements. Each blacklist operator has its own policies for removal. Some need evidence from you, some remove you automatically if your sending behavior has improved over time. 

Second, you might need to send a manual delisting request through regular support channels (yes, an email!). In this request, you can explain the situation — and receive a list of steps to fix the problem. There is also an option for automatic delisting, especially for behavior-based lists that monitor ongoing activity.

Note that it’s not recommended to continue sending emails while you are still blacklisted — this might hurt your sender reputation even more. Yes, it takes time, and timing depends on the blacklist you ended up on. Sometimes it takes hours, sometimes — even weeks.

Email blacklist removal: step-by-step process

Here are the steps that you should take to get your domain or IP address removed from there.

Step 1. Identify the blacklist you’re on

The first step is to identify which blacklist you are on. To verify the domains and IP addresses of the sending server, email services refer to authoritative blacklists such as Spamhaus or SpamCop. 

There are special checkers that you can use to see if an IP address or domain is on a blacklist. Some popular email blacklist checker tools include MxToolbox, DNSBL.info, DNS Checker, Sitechecker, Site24x7, and BlacklistMaster. To use these tools, simply enter your IP address or domain name into the search field and click “Blacklist Check”.

Analyze your domain/IP status. A green checkmark means that your server is not detected in the list:

Step 2. Investigate and fix the root cause

The next step is to figure out how you’ve ended up on a blacklist. Let’s give a quick overview of the reasons for blacklisting:

• Invalid contact list
• Spam complaints 
• Poor content
• Poor sending practices
• Technical errors (like domain warm-up, or troubles with domain authentication)

This is not a full list, but a good place to start. 

Step 3. Submit a delisting request

Send an email to the support team of the site whose blacklist you are on. Explain in detail what happened and what actions have been taken to resolve the problem. Once the problem has been fixed, you will be taken off the list automatically.

Tips to avoid getting blacklisted

Getting blacklisted can harm your email reputation and the business as a whole. Here are some tips to help you avoid it:

Do not buy or rent recipient lists

One of the most common reasons why businesses are getting blacklisted is that they purchase or rent recipient lists. This is a huge no-no in email marketing, as it almost always guarantees that you will end up on a blacklist. 

When you purchase or rent a list, you have no idea who those email addresses belong to or whether the owners of these emails would actually want to receive your emails. This often leads to a high number of spam complaints, which is something that blacklist providers take very seriously. So it’s better to build an email list on your own organically. It’s slower but much safer that way.

Some of the most common list-building techniques include lead magnets and exit-intent pop-ups. 

A lead magnet can be a compelling offer that your website visitors cannot resist. It can be an exclusive discount, a giveaway, a free limited subscription, or a piece of content. In exchange for your offer, your audience can give you their email address.

Exit-intent pop-ups, on the other hand, can help you capture the email addresses of users who are already leaving your website. Right before they do, your pop-up can make them stay for a little longer. When designed well, your exit-intent pop-up can pique your visitors’ curiosity and make them reconsider your offer.

Monitor recipient engagement and complaint rates

If you’re not monitoring how recipients interact with your emails, you could be unintentionally harming your sender domain reputation. When your emails are not being opened, it signals to email service providers that your subscribers don’t find your emails interesting or relevant. What if your recipients mark you as a spammer? This can lead to your emails going straight to the spam folder.

Make sure to track key metrics like open rate and click-through rate, as well as unsubscribes and email bounces. This data will give you a good idea of how engaged your subscribers are and whether or not they’re actually interested in the content you’re sending. Good reminder to keep your content quality in check. 

Duolingo sends out unobtrusive re-engagement emails to ask if their subscribers plan to take lessons and remind them once again.

Use double opt-ins and maintain list hygiene

Using single opt-in can be faster when you want to collect email addresses, but it can be risky. When you don’t require a confirmation or an additional step before an email is added to your list, you might end up with fake emails or mistyped email addresses, which can cause your future emails to bounce. This will hurt your deliverability and harm your reputation.  

When you apply an active opt-in process (also called double opt-in), people have to take an extra step to confirm their subscription before they’re added to your list. With double opt-in, you can be sure only those who really want to be on your list are on it. In turn, this will reduce the chances of getting complaints or having your emails marked as spam. 

Maintaining your list hygiene is also crucial. Constantly remove suspicious emails from your list, and use email verifiers — Selzy’s free bulk email verifier can help you with that. Here is what it looks like:

Remove inactive subscribers

Keep an eye on the email list hygiene. Subscribers may lose interest in your newsletters – this is normal. If you see that some members of your audience do not engage with your emails or do not open them at all, conduct a campaign to re-engage them. 

Never forget to include an unsubscribe URL in your marketing emails so that people can opt out of your list if they want to.

Those users who continue not to open your newsletters should be removed from your list. Otherwise, they may eventually have a bad effect on your email deliverability. When a significant fraction of your audience continually skips your emails or deletes them right away, email service providers might think that your emails are irrelevant, and they could decide to block your emails in the future.

Don’t link to disreputable websites

When it comes to blocking issues, the most important feature of your emails is links. Linking to pages outside your domain or using a link shortener (practices commonly done by spammers) can be a red flag to security providers, which could lead to blacklisting.

Final thoughts and FAQs

As we are wrapping up, let’s review some frequently asked questions:

• What is an email blacklist? An email blacklist is a list of domains and IP addresses that are considered to be spam. Email providers use multiple blacklists to protect their users from spam. When an email from a blacklisted address or domain is received, it is typically blocked or sent to the recipient’s spam folder. Email blacklists are maintained by both public and private organizations. Email providers may also maintain their own internal blacklists.

• Can I avoid my email getting blacklisted? In general — yes, if you are sticking to good email etiquette and practices. Grow your contact list organically, set up a proper authentication, produce great content and check content quality, and constantly monitor your email marketing campaigns’ performance. These measures can keep you off any blacklists.

• How to check if my email has been blacklisted? There are a couple of signs of this: high email bounce rate and delivery failure, sudden drops in open rates and engagement metrics, unusual alerts from your ESP. You can also manually use email blacklist checker tools, for example, MxToolbox or DNSBL.info. If you have a “listed” status on any of them — this is a confirmation. 

• How do I remove my email from a blacklist? First, identify what list you are in and what caused the problem. Then you might need to manually request delisting by writing to the blacklist operator. Depending on the problem and the operator, removal can take from a few hours to several weeks. Of course, you will need to fix the problem on your side first by following the guidelines from the support channel. 

In the end, email blacklisting is not as scary as it might sound, but it is better to avoid it at all costs. Your reputation, marketing budget, time, and resources are on the line here. And we can add one more thing — Selzy can help avoid blacklists with dedicated IPs, email list verification, great list hygiene practices, and everything to build engaging emails. Stay email safe!