Email Blacklist: How to Get Off It (By Avoiding It In The First Place)

As an email marketer, landing on an email blacklist can feel like being sent to the principal‘s office. Your deliverability plummets, your sender reputation tanks, and your hard-earned subscribers never even see your carefully crafted content. It‘s every marketer‘s worst nightmare.

But here‘s the thing: the best way to get off an email blacklist is to never end up on one in the first place. Prevention is key when it comes to maintaining a squeaky clean sender reputation and keeping your emails out of spam purgatory.

In this comprehensive guide, we‘ll dive deep into the world of email blacklists – what they are, how they work, and most importantly, how you can stay off them for good. We‘ll cover actionable tips and best practices for avoiding the dreaded blacklists, as well as provide a roadmap for what to do if you find yourself on one.

By the end of this article, you‘ll have all the knowledge and tools you need to confidently navigate the complex landscape of email deliverability in 2024 and beyond. Let‘s get started!

What Exactly is an Email Blacklist?

Before we dive into prevention and remediation strategies, let‘s make sure we‘re all on the same page about what an email blacklist actually is.

In simple terms, an email blacklist is a list of IP addresses or domains that have been identified as sources of spam or malicious email. These lists are compiled and maintained by various blacklist operators, internet service providers (ISPs), and anti-spam organizations as a way to filter out unwanted email traffic and protect users from spam, fraud, and abuse.

Some of the most well-known and widely used email blacklists include:

  • Spamhaus: The Spamhaus Block List (SBL) and Domain Block List (DBL) are two of the most influential blacklists, used by many major ISPs and email providers.

  • Barracuda Reputation Block List (BRBL): Maintained by the Barracuda spam filtering service, the BRBL tracks IP addresses with poor reputations.

  • SpamCop: This blacklist is based on spam reports submitted by SpamCop users and spam traps.

  • Composite Blocking List (CBL): The CBL lists IP addresses that have sent spam to its spam trap network.

  • Passive Spam Block List (PSBL): This list tracks IP addresses that have sent spam to honeypot email addresses.

If your IP address or domain lands on one of these (or other) blacklists, your email deliverability can suffer major consequences. Many email providers and spam filters reference these lists to help determine which emails to block or filter out. So getting blacklisted can cause a significant portion of your emails to never even make it to the inbox.

But just how common is it to get blacklisted? Unfortunately, it‘s more prevalent than you might think. A study by Validity found that the average email sender is blacklisted 4.3 times per month – a 154% increase from the previous year. And the higher your email volume, the more likely you are to run into deliverability issues.

The consequences of a blacklisting can be severe and far-reaching. According to research by Return Path, ending up on a blacklist can cause your deliverability rates to plummet by 60-70% or more. Your sender reputation can take a major hit, and it can take weeks or even months to fully recover.

So needless to say, avoiding email blacklists is crucial for the health and success of your email program. But how exactly do you end up on one in the first place? Let‘s take a look at some of the most common triggers.

The Top Reasons Email Senders Get Blacklisted

Contrary to popular belief, email blacklisting isn‘t just reserved for spammers and scammers. Even legitimate senders with the best of intentions can find themselves on a blacklist if they‘re not careful. Here are some of the most common reasons marketers get blacklisted:

  1. High Complaint Rates: If too many of your recipients report your emails as spam, it‘s a major red flag to blacklist operators. According to Return Path, senders with a complaint rate of just 0.1% (1 complaint per 1,000 emails sent) are over 4x more likely to be blacklisted than those with lower complaint rates.

  2. Poor Email List Hygiene: Sending to invalid, inactive, or role-based email addresses (like [email protected]) can wreak havoc on your deliverability. These addresses are more likely to bounce or get caught in spam traps, which can land you on a blacklist.

  3. Sudden Spikes in Volume: If you dramatically increase your sending volume out of the blue, it can trigger spam filters and raise eyebrows with blacklist operators. Consistent and stable volume is key.

  4. Lack of Permission: Sending emails to people who haven‘t explicitly opted in to your list (like purchased or scraped addresses) is a surefire way to rack up complaints and get blacklisted.

  5. Misleading or Spammy Content: Using deceptive subject lines, spammy keywords, or misleading links in your emails can get you flagged as a spammer by both recipients and spam filters.

  6. Neglecting Email Authentication: If you‘re not properly authenticating your emails with SPF, DKIM, and DMARC, it can hurt your sender reputation and increase your chances of getting blacklisted.

Now that we know some of the common causes of blacklisting, let‘s dive into how you can proactively avoid them and keep your sender reputation squeaky clean.

Email Best Practices to Stay Off the Naughty List

Staying off email blacklists is all about consistently following email marketing best practices. By making these strategies an integral part of your email operations, you can drastically reduce your risk of getting blacklisted. Here are some of the key do‘s and don‘ts to keep in mind:


  • Only email people who have explicitly opted in to your list (no purchased, rented, or scraped addresses!)
  • Use a double opt-in process to confirm new subscribers and protect against invalid addresses
  • Set clear expectations from the start about what kind of content subscribers will receive and how often
  • Regularly clean your email list to identify and remove inactive, unengaged, or invalid addresses
  • Keep a close eye on your engagement metrics and proactively remove consistently unengaged subscribers
  • Promptly remove any addresses that hard bounce to maintain a low bounce rate
  • Stick to a consistent and stable sending schedule and volume (no sudden spikes!)
  • Make the unsubscribe process easy and painless, and honor unsubscribe requests promptly
  • Use a reputable email service provider that prioritizes deliverability and follows industry standards
  • Implement email authentication protocols (SPF, DKIM, and DMARC) to prove you‘re a legitimate sender
  • Regularly monitor blacklists and your sender reputation for any red flags or issues


  • Purchase, rent, or scrape email addresses from third-party sources (just don‘t do it!)
  • Use misleading, clickbait-y, or spammy subject lines, sender info, or email content
  • Make it difficult for subscribers to unsubscribe or hide/obscure the unsubscribe link
  • Send from a free domain email address (like or
  • Ignore email bounces, spam complaints, or other signs of deliverability issues
  • Blast your entire list with high frequency (no one wants to be bombarded with emails!)
  • Rely on dirty tricks or shortcuts to grow your list or improve metrics
  • Neglect email hygiene and regular list maintenance
  • Assume that blacklisting "won‘t happen to you" – be proactive about prevention!

By adhering to these fundamental best practices, you can maintain a positive sender reputation, keep your list clean and engaged, and avoid landing on any blacklists.

Remember, there are no shortcuts or quick fixes when it comes to email deliverability. Consistent, ethically-sound habits will serve you far better in the long run than any short-term hacks or tricks.

Help! I‘m on a Blacklist – Now What?

But what if despite your best prevention efforts, you find yourself on the dreaded blacklist? First of all, don‘t panic. While getting blacklisted is a serious issue, it doesn‘t have to be a permanent death sentence for your email program. With the right actions and a bit of patience, you can get delisted and restore your sender reputation.

Here‘s a step-by-step action plan for getting off a blacklist:

  1. Immediately pause all email sending from the blacklisted IP address or domain until you resolve the root issue. Continuing to send will only make matters worse.

  2. Identify which blacklist(s) you‘re on and carefully review their individual delisting protocols and requirements. Some blacklists have simple form submissions, while others require more extensive information and manual reviews.

  3. For blacklists with manual review processes, you‘ll typically need to explain how you landed on the list in the first place and provide a detailed plan for what changes you‘ll implement going forward to prevent it from happening again. Be honest, thorough, and sincere.

  4. Conduct a deep clean of your email list to remove any questionable addresses that may be negatively impacting your reputation. Purge any inactive, unengaged, role-based, or invalid emails that may be contributing to bad metrics.

  5. Carefully review your email content and messaging for anything that could be perceived as misleading, spammy, or inauthentic. Make adjustments as needed to align with best practices and create value for your audience.

  6. Implement or update your email authentication protocols (SPF, DKIM, and DMARC) to showcase your legitimacy and commitment to proper sending practices.

  7. Reach out to the blacklist operators with updates on your progress and to check the status of your delisting request. Be polite, patient, and persistent. Some blacklists have a clear delisting process documented, while others are less transparent.

  8. Monitor your email metrics closely (opens, clicks, bounces, unsubscribes, spam complaints) for any unusual activity or red flags, even after you‘ve been delisted. Keep a pulse on your overall email health.

  9. Once you‘re successfully delisted, ease back into email sending gradually. Don‘t immediately blast your entire list – start with a smaller segment of engaged subscribers and slowly ramp back up while monitoring engagement and deliverability.

  10. Commit to consistent email best practices long-term to continually improve your sender reputation and prevent future blacklisting. Don‘t fall back into old habits – make permanent positive changes.

Unfortunately, there‘s no magic formula or secret handshake to get immediately delisted. Getting back in the good graces of blacklist operators and ISPs takes time, effort, and patience. But by being proactive, transparent, and committed to change, you can overcome a blacklisting and get your email program back on track.

Key Takeaways for Blacklist Prevention & Recovery

Whew! We‘ve covered a lot of ground in this comprehensive guide to email blacklists. To recap, here are the key points to remember:

  • Email blacklists are used by ISPs, email providers, and anti-spam organizations to filter out senders with poor reputations. Getting on one can seriously hurt your deliverability.

  • Some of the most common reasons marketers get blacklisted include high complaint rates, poor list hygiene, sudden spikes in volume, lack of permission, spammy content, and neglecting authentication.

  • To avoid landing on a blacklist in the first place, follow email best practices like using double opt-in, maintaining a clean list, sticking to a consistent sending schedule, making unsubscribes easy, and using proper authentication.

  • If you do find yourself on a blacklist, don‘t panic. Pause all sending, identify the root cause, and start the delisting process with the blacklist operator. Be prepared to implement positive changes.

  • Regularly monitoring your email metrics, sender reputation, and blacklist status can help you spot and resolve deliverability issues before they spiral out of control.

  • The best way to get off a blacklist is to never get on one in the first place. Commit to being a good sender and continually providing value to your subscribers.

Landing on an email blacklist can feel like a big scary monster for marketers. But by being proactive, adhering to best practices, and focusing on quality over shortcuts, you can avoid the dreaded blacklists and achieve email success.

Remember, your email list is a privilege, not a right. Treat your subscribers with respect, deliver value consistently, and always strive to be the kind of sender that ISPs and recipients want to see in the inbox.

Stay vigilant, stay ethical, and happy sending!