Top 10 free email blacklist checker tools for 2025

An email blacklist, sometimes referred to as a blocklist, is a database of IP addresses, domains, or specific email addresses that have been identified as sources of spam, malicious emails, or overall suspicious email sending behavior.

When your email server's IP or sending domain is added to one of these lists, receiving email providers may block or filter your messages into the spam folder, hurting your deliverability.

What is an email blacklist checker?

An email blacklist checker is a tool that scans databases of blocked or suspicious IP addresses and domains to see if your email sending source is listed as a potential spammer. These databases are generally maintained by anti-spam organizations and major mailbox providers. They help filter out unwanted or harmful emails by enabling recipient email servers to divert blacklisted messages to junk folders or block them completely.

How email blacklist checkers work

There are many popular blacklist providers. Different companies or entities who keep records of suspicious email activity create a database of potentially harmful email sending sources. An email blacklist tool will check your domain or IP against real-time blacklists across providers to tell you if the email source you've entered appears in these databases.

Why email blacklist checkers are important

• They help diagnose sudden drops in email deliverability and engagement, a common sign that your sending address has been blacklisted.

• By identifying blacklist status quickly, senders can take action to correct poor sending practices or request removal to restore their reputation and deliverability.

Types of data the tools check

• Domain-based: Determines if your sending domain is flagged for spamming in a blacklist.

• IP-based: Checks if the IP of the server or service you use to send mail is considered suspicious by blocklist providers.

The top 10 free email blacklist checker tools

Here are 10 free tools you can use to check whether your sending domain or IP address has been added to a blacklist.

1. MXToolbox SuperTool

MXToolbox SuperTool is a versatile tool that allows you to check different parameters related to domains and IPs. Providing a comprehensive diagnosis for your IP, domain, or email, you can use the Blacklist Check option to scan more than 100 DNS-based email blacklists (DNSBL/RBL). The tool is user-friendly and widely trusted. 


The result looks like this: 
 

2. DNSChecker IP blacklist checker

DNSChecker is mentioned as an IP blacklist checker, but you can enter your IP, domain, or email address to cross reference more than 50 anti-spam blacklists. It delivers results fast and shows proof of blacklisted records, making it ideal for quick action. If you enter your domain, it will fetch the associated IP addresses based on the MX records. You can click on the IP addresses to check if they're on blacklists. 


The result looks like this: 


 

3. EmailListVerify Blacklist Checker

EmailListVerify blacklist checker tool checks your sending IP or domain against 100+ real-time blacklist servers. It's free, and its clean interface makes it easy to use. It will show you instantly if you're clear to proceed, along with the blacklists it has checked. It's a great tool for quick diagnostics. 


The result looks like this: 


 

4. ZeroBounce Blacklist Checker

ZeroBounce offers both IP and domain blacklist checks, showing precise information about where your addresses have been blacklisted. Along with blacklists, this tool also mentions if the email source you've input has been whitelisted. You can use the filters available to choose which option you want to view. While it's a little slower than most of the other tools, the checker can be used to stay on top of the risk your emails face. 


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5. Blacklist Checker

Blacklist Checker tests any IP, email, or domain across more than 100 industry-standard blacklists. It features monitoring and API integration for broader automation and reporting needs. It works quickly to display the status immediately after running the test, along with detailed views of the lists and the pass or fail status.  


The result looks like this: 

6. HetrixTools Blacklist Checker

The HetrixTools checker provides in-depth IP and domain blacklist checks with real-time reports. It's a popular choice among IT teams for its detailed scans. You can click on the public report generated to view the blacklist history. It has continuous monitoring with alert capabilities. 


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7. DNSBL.info Database Check

DNSBL.info scans a broad DNSBL database and displays easy-to-understand results on blacklisting status. The drawback of this tool is that you can only use it to check your IPs, not domains. But it's simple, minimalistic, and effective. 


The result looks like this: 

8. WhatIsMyIP blacklist checker

WhatIsMyIP scans both DNS and SURBL blocklists, offering quick checks for IPs. Similar to the previous tool, you cannot use this directly to check if your domain has been blacklisted. Results are instant and usable for immediate troubleshooting.


The result looks like this: 

9. MultiRBL.valli.org checker

MultiRBL is a versatile checker that scans dozens of lists simultaneously. It aggregates blacklists across hundreds of blocklists with granular detail and historical data. It’s favored by network administrators for bulk review. You can see if your email source has been blacklisted, brownlisted, yellowlisted, whitelisted, neutralized, or if the test failed.  


The result looks like this: 

10. InboxAlly spam database looku

InboxAlly scans your IP or domain against more than 50 major spam databases including well-known blacklists like Spamhaus and Barracuda. It provides instant, easy-to-understand results without requiring sign-up. This tool is suitable for both quick manual lookups and in-depth reputation analysis to protect email deliverability effectively.


The result looks like this: