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Email Blacklists: Avoid Them At All Costs!

  • by Jake Lee
  • 17 min read
Email Blacklists: Avoid Them At All Costs!

Landing in an email blacklist can feel like being stuck in quicksand; the more you struggle, the deeper you sink. It is a digital purgatory no email marketer wants to experience, and, more importantly, it is a situation that you should work hard to avoid. Being on an email blacklist means your messages won’t reach the inboxes of your contacts. It can hurt your sender reputation and ruin all your hard work. This article is your guide to understanding what email blacklists are, why they are harmful, and what you can do to steer clear of them. Let’s dive in and learn how to safeguard your email marketing efforts.

What Are Email Blacklists?

Email blacklists, often called DNS blacklists or real-time blacklists (RBLs), are lists of IP addresses and domains that have been flagged for sending spam. Think of them as a “naughty list” for email senders. These lists are kept by different organizations, and they are used by email providers (like Gmail, Yahoo, or Outlook) to filter incoming email. If your IP address or domain shows up on one of these lists, your emails are likely to end up in spam folders, or get blocked altogether.

Types of Email Blacklists

There are many types of email blacklists but they can be broadly divided into two main categories:

  1. IP-Based Blacklists: These lists track IP addresses used to send emails. If an IP address is found to be sending spam, it is added to the blacklist, and this affects all emails sent from that IP.
  2. Domain-Based Blacklists: These lists track domain names used in email addresses. If a domain is linked to spam, all emails from that domain may be blocked.

Both IP-based and domain-based blacklists can be further divided into specific types, each with its own methods and criteria. For example, some blacklists are more focused on unsolicited bulk email, while others are geared toward known sources of phishing or malware.

How Email Blacklists Work

Email blacklists work by gathering data on email sending behavior. They use several techniques to spot spam, like:

  • Spam Traps: These are email addresses created solely to catch spammers. When you send to a spam trap, it’s a clear sign that your list is not clean and your sending behavior isn’t good.
  • User Complaints: If many users mark your emails as spam, this is a major red flag that can lead to being blacklisted.
  • Email Volume: Sending a very large number of emails in a short time can also make you look like a spammer.
  • Email Content: Using spammy words or phrases in your subject lines or email body can also cause a listing.
  • Unclean Email Lists: Sending emails to old or inactive email addresses is not good. It makes you seem like you don’t care about the people you’re sending to.

When one of these triggers an alert, the IP address or domain is added to the blacklist. Email providers then check incoming emails against these blacklists. If an email comes from a blacklisted source, it is either marked as spam or blocked.

Why Are Email Blacklists So Harmful?

Being on an email blacklist is bad news for your email marketing. Here are a few reasons why:

Damage to Your Sender Reputation

Your sender reputation is a score that email providers give to your IP address and domain based on your sending behavior. A good sender reputation means your emails are more likely to reach the inbox. A bad one means they are not. Email blacklists can quickly destroy your sender reputation. Once you are seen as a spammer, it is tough to regain the trust of email providers.

Lower Email Deliverability

One of the most immediate effects of being blacklisted is lower email deliverability. When your emails are blocked or sent to spam, you miss out on chances to connect with your audience. This means fewer people will see your message, and this can hurt your marketing and sales results.

Loss of Revenue

When your emails are not reaching the people who want to see them, you lose out on revenue. Marketing emails drive traffic, leads, and sales. If your messages are not delivered, you miss out on all these chances to earn money.

Waste of Time and Resources

Creating a good marketing campaign takes a lot of effort. If your emails end up in spam, that effort is wasted. All your hard work in creating great content, segmenting your lists, and making your emails look good is for nothing if no one sees your messages.

Difficulty in Getting off the List

Once you’re on a blacklist, it is not easy to get off. The process of removal can be long and hard, and there is no guarantee that you will be taken off quickly, or at all. You may have to contact each blacklist provider separately, and it can take some time to fix all the problems that got you listed.

How to Avoid Email Blacklists

Avoiding email blacklists is key to keeping your email marketing healthy. Here are a few practical steps you can take:

1. Get Clear Consent

The first step to avoiding blacklists is to make sure you have clear consent from everyone on your list. It is always better to grow your list organically, rather than buying lists. Never buy email lists. Here is why:

  • Double Opt-In: Use double opt-in for all sign-ups. This means users must click a link in a confirmation email to verify they want to subscribe. It confirms they really do want to hear from you.
  • Clear Signup Forms: Make your signup forms clear and easy to understand. Be honest about what users can expect to receive.
  • Unsubscribe Options: Always have a clear and simple way for people to unsubscribe from your emails. This should be a single click, and easy for users to spot. Never hide the link, or make it hard to understand.
  • Keep Records: Keep records of when and how users gave you consent to send them emails. This can help you show that you’re sending emails legally.

2. Keep Your Email Lists Clean

A clean email list is a must to have good deliverability and avoid blacklists. Here’s how you can keep your list in check:

  • Remove Inactive Addresses: Regularly remove email addresses that have not interacted with your emails for a while. Sending emails to inactive accounts lowers your engagement rates and can make you look like a spammer.
  • Correct Typos: Check your email list for typos. If someone enters their email address wrong, your emails will bounce. This hurts your sender reputation. Use email validation tools to catch typos.
  • Handle Bounces: Watch for hard bounces (invalid email addresses). Remove these right away. Too many hard bounces will hurt your sender reputation and could get you blacklisted. Use tools that can manage and track bounces.
  • Use List Segmentation: Segment your list based on user behavior and interests. Send emails relevant to what users have done and what they have said they want. This keeps your users engaged and happy with the messages you are sending.

3. Send Quality Content

Quality content keeps your users engaged and happy. High-quality content means better deliverability and helps you stay off blacklists. Here are some ways to make good content:

  • Relevant Information: Send emails that are useful and relevant to your users. Know your audience and speak to their needs and wants.
  • Personalized Messages: Try to make your messages personal. Use your user’s name, and tailor your message to their profile, their past activity, and interests.
  • Clear Call to Action (CTA): Use clear CTAs that tell your users what you want them to do, and make it easy for them to do what you want.
  • Avoid Spam Words: Do not use spam trigger words or phrases in your subject lines or email body. These can send your email right to the spam folder.
  • Professional Design: Use a clean and professional design. Make your messages easy to read. Don’t make your messages look too flashy, or like spam.

4. Watch Your Sending Volume and Frequency

The way you send your emails can affect your sender reputation and chance of getting blacklisted. Here’s what you need to watch:

  • Gradual Warm-Up: If you are starting a new email campaign, or using a new IP, do not send all your emails at once. Start with a low volume and raise it over time. This is called warming up your IP. This stops email providers from thinking you’re a spammer.
  • Consistent Frequency: Be consistent with how often you send your emails. Don’t suddenly send too many emails one day and none the next. Try to be consistent with when and how many emails you send.
  • Avoid Sending Bursts: Do not send all of your emails at the same time. Use a schedule that distributes emails out over time. This will make your sending look more like a real person and less like a robot.
  • Watch Sending Limits: Know the sending limits of your email service. Do not go over these limits. This could cause problems for your email reputation and deliverability.

5. Check Your Authentication

Email authentication helps to prove that you are who you say you are. It makes email providers trust you and helps keep you off blacklists. Here is what you need to do:

  • SPF (Sender Policy Framework): Add an SPF record to your domain. This tells email providers which servers are allowed to send emails on your behalf. This stops others from sending emails pretending to be you.
  • DKIM (DomainKeys Identified Mail): Set up DKIM signing. This lets email providers check if the emails were actually sent by you. It stops email spoofing.
  • DMARC (Domain-based Message Authentication, Reporting & Conformance): Set up DMARC to tell email providers how to deal with messages that fail SPF and DKIM checks. This lets you know what email providers are doing with your messages. This also lets you report abuse.

6. Use a Reputable Email Service Provider

The Email Service Provider (ESP) that you use has a big impact on your email deliverability and sender reputation. When picking an ESP, consider:

  • Deliverability Rates: Look for an ESP with a good history of email deliverability. They should have tools to help you avoid blacklists, and give good performance.
  • Compliance Features: Pick an ESP that has all the compliance tools you need, like double opt-in, unsubscribe options, and email list management.
  • Support and Resources: Look for an ESP that has good support and learning resources. This will help you fix any issues that come up.
  • Reputation Monitoring: An ESP should let you watch your sender reputation, IP address, and domain health. This helps you spot and fix problems right away.

7. Monitor Your Email Performance

Watching your email performance metrics is key to spotting problems and keeping your emails out of spam folders. Be sure to watch these important metrics:

  • Open Rates: Track your open rates. Low open rates might mean your subject lines are not good, or that your emails are not reaching the inbox.
  • Click-Through Rates: Track your click rates. Low click rates may mean your email content is not good, or that it isn’t relevant to your audience.
  • Bounce Rates: Watch for hard and soft bounces. High bounce rates are a big red flag. You need to address these right away.
  • Spam Complaints: Always watch your spam complaints. High spam complaints will make you look bad. You need to stop users from marking your messages as spam.
  • Unsubscribe Rates: Watch your unsubscribe rates. High unsubscribe rates mean your messages are not relevant to your users.

You can track all these numbers in the reports of your ESP. Use this data to learn and adjust your email marketing strategy as needed.

8. Test Your Emails

Testing your emails helps to make sure they are working well, and helps to keep them out of the spam folder. Here are some important things you should test:

  • Subject Lines: Try out different subject lines. Find the ones that get the most opens. Always use A/B testing to try out what is working best.
  • Email Content: Test different types of email content, such as messages, images, and CTAs. Know what your users like.
  • Email Rendering: Test how your emails look on different devices and email clients. This makes sure your message looks good for everyone.
  • Spam Filters: Test your emails using a spam checker before you send them out. You must make sure your message will not land in the spam folder.

Use the data you get from your testing to make better emails and improve your results.

9. Use Feedback Loops

Feedback loops (FBLs) are an important tool to monitor your spam rates. FBLs let you know when users mark your messages as spam. Here’s how they work:

  • Set up FBLs: Set up FBLs with major email providers. This will give you real-time data when someone marks your message as spam.
  • Address Spam Complaints: When you get an FBL notice, check why. Remove the user from your list and adjust your approach to stop future complaints.
  • Use FBL Data to Improve: Use FBL data to learn what’s causing users to mark your messages as spam. Use this data to make improvements to your email strategy.

10. Keep Up with Email Best Practices

Email marketing is always changing, with new methods and best practices coming out all the time. You must stay up to date:

  • Read Industry Blogs: Follow email marketing blogs. You will learn a lot. Stay informed about the latest trends.
  • Join Communities: Join email marketing communities. This is how you get to talk with others and share tips and best practices.
  • Go to Events: Try to go to email marketing events. This is how you learn from experts and stay on top of your game.
  • Keep Learning: Make learning a habit. Always seek out new information to improve your email marketing skills and results.

How to Get off an Email Blacklist

Even with all your best efforts, you may still land on a blacklist. It’s not the end of the world. Here’s how to get off a blacklist:

1. Find Out You’re on a Blacklist

If your emails aren’t getting delivered, or they are going straight to the spam folder, you need to check if you are on a blacklist. Here is how:

  • Check Blacklist Databases: Use online tools to check if your IP address or domain is listed on any email blacklists. Many free sites let you check many lists at once.
  • Watch for Error Messages: You may get an error message if your message gets bounced, or blocked. These messages may tell you that you are blacklisted. Watch for these messages.
  • Use Your ESP: Your ESP should have tools that will help you spot issues and will let you know if you are on a blacklist.

2. Understand Why You’re Blacklisted

Once you know you are on a blacklist, you need to know why. Knowing why you were listed will help you fix the issues so that you don’t get blacklisted again.

  • Check Blacklist Reports: Most blacklists will tell you why you were listed. The reasons may be user complaints, spam traps, or a bad reputation.
  • Review Your Email Activity: Look at your recent sending activity. Have you sent to an old list? Did you send too many emails at once? Try to find the trigger that got you blacklisted.
  • Check Your Logs: Your ESP logs will show you the bounce rates, complaints, and sending volumes. Find any irregularities that could be the cause.

3. Take Steps to Fix the Problems

Once you know the causes, fix them right away.

  • Clean Your Email List: Remove all bad addresses from your list. This means old and inactive emails. This will help your reputation with email providers.
  • Improve Your Sending: Adjust your sending strategy. Do not send too many emails at once. Try to warm up your IPs. Keep your sending to consistent volumes and frequencies.
  • Improve Your Content: Make your emails better. Send useful content and make them relevant to the needs and wants of your audience. Avoid spam trigger words and phrases.
  • Fix Authentication Issues: Make sure your SPF, DKIM, and DMARC records are correct. This helps your email authentication and builds trust with email providers.

4. Request Removal from the Blacklist

Once you have fixed the problems, you can ask to be removed from the blacklist.

  • Contact the Blacklist Provider: Each blacklist has its own process for removal. Follow all the instructions they have.
  • Give Proof of Action: Tell the blacklist provider what you did to fix your email program. Show that you fixed your issues, and are no longer a threat.
  • Be Patient: Removal from blacklists can take time. Be patient and wait. Don’t try to rush the process or do something to make it faster. It may take a while before your IP or domain is taken off the list.
  • Monitor Your Status: Even after you have been taken off the list, keep monitoring your status. Make sure that you don’t go back to the bad ways that got you on the list in the first place.

5. Keep Your Email Practices Healthy

To make sure that you do not get back on a blacklist again, keep your email marketing healthy.

  • Always Monitor: Keep monitoring your email metrics, spam rates, and deliverability. This will help you find any problems before they get out of control.
  • Review Your Practices: Check your email marketing practices to make sure they meet the current best practices.
  • Learn and Improve: Keep learning about email marketing. Use data to improve. Watch for new ways to engage your audience and stay out of the spam folder.

The Cost of Ignoring Email Blacklists

Ignoring email blacklists can have serious results for your business. Here are some of the most important points:

Lost Sales and Revenue

If your emails are not getting delivered, your sales will suffer. If your messages are going to spam, you won’t have as many chances to engage with your audience and make sales.

Damaged Brand Image

Being known as a spammer will hurt your brand. When you send unwanted emails, users will think less of you, and this could hurt your business image.

Poor Customer Engagement

When users do not get your messages, they are less likely to engage with you and your brand. Poor customer engagement can hurt loyalty and make it more difficult to build relationships with your audience.

Time and Resources Wasted

A lot of time and money is spent making email campaigns. If your emails are going to spam, your marketing efforts are wasted. This can cause you to miss your goals.

Difficult Recovery

Once you get on a blacklist, it takes time, money, and effort to get off. It’s easier to avoid blacklists than to try and recover from them after they happen.

Steer Clear of Blacklists

Email blacklists are a major problem for email marketers. They can hurt your sender reputation, reduce your deliverability, and cause you to lose revenue. To avoid the bad effects of email blacklists, you need to use ethical email marketing practices. Start by getting clear consent, cleaning your email lists, sending quality content, and authenticating your emails. Keep monitoring your performance and use the data to make your strategy better. By being proactive, and working hard to avoid blacklists, you will get better email results, and build stronger relationships with your audience. You will also keep your emails out of the spam folder. This will help you get better returns for all your effort. You need to do all the hard work if you want your email campaigns to be seen, read, and make money.

Jake Lee

Jake Lee

Jake Lee is Inboxify's Deliverability & Automation Specialist, ensuring our clients' emails reach the inbox every time. He's a certified expert in email authentication protocols and deliverability best practices, with a proven track record of improving sender reputations and maximizing email ROI.

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