How to Perform an Email Blacklist Check and Why It Matters

An email blacklist check is essential for any small business that relies on email to reach customers and prospects. Being on a blacklist means your emails may be blocked or sent to spam folders, reducing your chances of closing deals or maintaining relationships. This article covers why email blacklists happen, how to check for them, an example scenario, common pitfalls, and how HelloGrowthCRM supports better email communication.

Why this comes up / what goes wrong

Small businesses often face email deliverability problems without realizing their sending domain or IP address is blacklisted. This can happen if your email server has been compromised, if you send bulk emails without proper safeguards, or if recipients mark your messages as spam. When your emails are blocked or filtered out, leads don’t get your offers and your sales pipeline suffers. Checking email blacklists helps uncover these hidden barriers.

Step-by-step

1. Identify your sending IP and domain: Find the IP address and domain name your emails are sent from. This is usually your email provider or your business domain.

1. Use online blacklist checking tools: Visit reputable blacklist check websites such as MXToolbox, MultiRBL, or DNSBL.info. Enter your sending IP and domain to scan multiple blacklist databases.

1. Review blacklist results carefully: If your IP or domain appears on any list, note which ones and the reasons if provided.

1. Check your email sending practices: Ensure you follow best practices like using SPF, DKIM, and DMARC authentication records to prove your emails are legitimate.

1. Request removal from blacklists: Follow the removal procedures on each blacklist site. This often involves fixing the underlying issue and submitting a removal request.

1. Monitor your email reputation regularly: Make blacklist checks a routine part of your email health monitoring to catch issues early.

1. Improve email follow-up with automation: Use tools like HelloGrowthCRM’s email automation and sequences to manage outreach and reduce spam complaints.

Example (fictional figures)

A residential real-estate team in Phoenix, Arizona, sends monthly newsletters and property offers from their domain realestatephoenix.com. On 03/15/2026, they notice a 25% drop in email open rates.

Step 1: They identify their sending IP as 192.0.2.45.

Step 2: They check blacklists at MXToolbox and find their IP on a spam blacklist.

Step 3: The blacklist cites high complaint rates.

Step 4: They review their email list and remove unengaged contacts.

Step 5: They add SPF, DKIM, and DMARC records to their domain.

Step 6: They submit a removal request on the blacklist site.

Step 7: After two weeks, their IP is removed, and open rates recover.

Common mistakes

• Ignoring email authentication records: Not setting up SPF, DKIM, and DMARC makes it easier for your emails to be flagged. Prevent this by configuring these records correctly.

• Using purchased or outdated email lists: Sending to unverified contacts increases spam complaints. Always build your list organically.

• Not monitoring blacklist status regularly: Blacklist status can change anytime. Schedule routine checks.

• Sending bulk emails without segmentation: Sending irrelevant emails leads to unsubscribes and complaints. Use targeted campaigns.

• Failing to provide easy unsubscribe options: This frustrates recipients and increases spam reports. Include clear unsubscribe links.

Doing this in HelloGrowthCRM

HelloGrowthCRM offers a HelloMail shared inbox where your team can see all replies to quotation emails, ensuring no lead is missed due to email issues. Its Sequences and campaigns feature automates follow-ups over two weeks and stops immediately when a prospect replies, reducing the chance of spam complaints and improving engagement. These tools help manage email outreach efficiently while maintaining good sender reputation.

Frequently asked questions

What is an email blacklist? An email blacklist is a database of IP addresses or domains known for sending spam or unwanted emails. Email servers use these lists to block or filter incoming messages from blacklisted sources.

How often should I check if my email is blacklisted? Regular monitoring is important. Ideally, check at least once a month or whenever you notice a drop in email deliverability or engagement.

Can I get removed from an email blacklist? Yes, most blacklists offer a removal process. You usually need to fix the issue causing the listing, such as cleaning your email list or improving authentication, then submit a removal request.

Does using email automation increase the risk of blacklisting? Not if done correctly. Using tools like HelloGrowthCRM’s email automation and sequences with proper list management and opt-in contacts helps reduce spam complaints and maintain a good sender reputation.

What are SPF, DKIM, and DMARC? These are email authentication protocols that verify your emails are sent from authorized servers. They help prevent spoofing and improve deliverability.

Key takeaways

• An email blacklist check reveals if your sending IP or domain is blocked, affecting deliverability.
• Use reputable online tools to scan multiple blacklists regularly.
• Fix underlying issues like poor list hygiene and missing authentication before requesting removal.
• Avoid common mistakes like ignoring SPF/DKIM/DMARC and sending to unverified lists.
• HelloGrowthCRM’s shared inbox and automated sequences help manage email outreach and reduce spam risk.

Start improving your email deliverability today by performing an email blacklist check and using tools that help you follow up efficiently. Start on the Free Forever plan (200 leads, no credit card).