Spam Database Lookup
Our free blacklist checker allows you to scan your domain or IP across dozens of industry-leading blacklists used by Google, Microsoft, and all major inbox providers
100% free. No account or sign-up needed.
Don't just test for deliverability — Repair, increase, or optimize your email deliverability with InboxAlly
Running a blacklist check is only the first step. InboxAlly helps you take action.
InboxAlly actively improves your inbox placement by rebuilding your sender reputation. If you are on a blacklist or have low open rates, we can help mailbox providers recognize your messages as wanted.
• Automatically monitor your domain and IP
• Get instant blacklist alerts and delisting guidance
• Improve open rates through smart inbox placement training
• Maintain trust and avoid future spam folder issues
Many users see open rates double in just 1–2 weeks.
Protect Your Sender Reputation
You can easily land on a blacklist. Staying off blacklists takes ongoing vigilance.
Why You Need to Monitor Regularly
Blacklist status can change without warning, especially if you share an IP or use a third-party sending platform. One unnoticed listing can cause your email messages to bounce, go to spam, or vanish altogether. Make blacklist checks part of your routine:
- Check listings before major campaigns
- Check listings after IP/domain changes
- Check listings weekly for ongoing email programs
The key to reliable email delivery is ongoing vigilance. Blacklist status can change quickly, so it is important to check your domain and IP before every major campaign. By regularly checking for new listings, you can fix problems quickly. This helps you avoid surprises that could affect your deliverability.
Our Blacklist Checker gives you a clear report every time you run a check. To keep you safe, our paid service checks your domains and IPs all the time. The system will alert you right away if it finds a problem. This proactive approach lets you resolve potential issues early and keep your sender score strong.
Make blacklist monitoring a part of your routine and give your emails the best possible chance to reach the inbox. Staying ahead of reputation threats is one of the most effective ways to ensure consistent email performance and engagement.
How Blacklists Impact Your Deliverability
Mailbox providers like Gmail and Outlook use blacklist data. This helps them decide if they will deliver, filter, or block your email.
Even if your content and email authentication (SPF, DKIM, DMARC) are perfect, a listing can stop your emails cold. Basic spam tests aren’t enough because they miss the deeper infrastructure issues tied to sender reputation.
What to Do If You’re Listed
Review Your Blacklist Report
Carefully examine the listing information provided by InboxAlly’s Blacklist Checker. Most blacklists will include the reason for listing and offer specific removal instructions or a delisting request link.Identify the Cause of the Listing
Investigate the root cause—such as compromised web forms, spam complaints, poor list hygiene, or sending from a shared IP address. Address any technical or list management issues that may have triggered the listing.Fix the Underlying Issue
Take corrective actions to resolve problems at their source. This may include tightening list permissions, updating security settings, or improving email acquisition practices.Follow Delisting Instructions
Use the removal request link or instructions provided by the blacklist. Complete any required forms and communicate that you have resolved the root issue.Monitor Your Status Regularly
Continue monitoring your domain and IP address using InboxAlly’s Blacklist Checker to ensure you remain off blacklists and maintain strong sender reputation.
How to stay in the Inbox?
- A blacklist checker is important for protecting your email reputation. However, keeping your emails in the inbox needs a full strategy. Focus on sending messages only to subscribers who are genuinely interested and engaged. Keep your list clean by regularly removing invalid or inactive email addresses, and use real-time email address validation when people sign up.
- Monitor your sending practices and avoid sudden changes in volume that could signal risky behavior to inbox providers. Watch for spam complaints and promptly address any issues that arise. Regularly check both your domain and IP addresses with a blacklist checker to catch potential reputation problems early, and resolve any listings as soon as they appear.
- Check out InboxAlly’s Ultimate Email Deliverability Tool. It can automatically monitor your domains and IPs. It helps email service providers see your messages as wanted. With good email sending habits and regular monitoring, you can increase your chances of reaching the inbox every time.
Frequently Asked Questions
How often should I check my domain or IP for blacklisting?
We recommend checking at least weekly, and always before launching a major email campaign. Blacklist status can change quickly, especially if you're sending from shared infrastructure or warming a new domain. For hands-free protection, InboxAlly can monitor your domain and IP 24/7 and alert you the moment something changes.
Do emails bounce back if blocked?
If a mail server blocks an email, it may send a bounce message or the email may fail silently. It could also go to the recipient’s spam or quarantine folder, based on the filter's rules.
Why is my IP address on a blacklist?
Your IP may be blacklisted due to spam-like behavior, high bounce rates, sending to spam traps, malicious activity, or sharing an IP with another sender who triggered abuse reports. Even one misstep — or another sender on the same server — can lead to a listing. A receiver receives an email from a sender, and the sender's IP address is checked against a blacklist. If it's listed, the email may be blocked, filtered, or delayed.
How do I fix a blacklisted IP?
Visit the blacklist provider’s website for removal instructions. Most will require you to resolve the issue that caused the listing, such as spam complaints, malware, or poor list hygiene, before you contact them to request removal. After resolving the root cause, continue monitoring your IP to ensure it stays clean and avoid future listings.
How to prevent IP blacklisting?
- Send emails only to people who have opted in.
- Avoid using spammy content.
- Keep an eye on bounce and complaint rates.
- Make sure to keep your email list clean.
- Use proper authentication (SPF, DKIM, DMARC).
- Avoid sudden spikes in sending volume, and scan regularly for blacklist status.
- If you share an IP, ensure your provider maintains strong reputation standards.
How does InboxAlly’s Domain & IP Blacklist Checker work?
InboxAlly’s Domain & IP Blacklist Checker gives you clear visibility into an important aspect of your email sender reputation deciding if your emails can reach the inbox instead of the spam folder. When you enter a domain or IP address, the tool instantly scans it across dozens of major spam and reputation blacklists such as Spamhaus, SURBL, Barracuda, and more.
It goes beyond a simple “listed or not” result by providing detailed insights for each blacklist, direct links for more information or removal requests, and clear explanations about what each listing means for your email deliverability. The checker also detects if your IP is part of a shared hosting environment or CDN, helping you understand which issues actually affect your domain.
By regularly using the Blacklist Checker along with InboxAlly’s other deliverability tools, you can quickly identify and resolve reputation threats, stay compliant with best practices, and make sure your emails consistently reach your audience. This proactive approach helps protect your sender reputation and improve the results of your email campaigns.
What additional features does the Blacklist Checker include?
InboxAlly’s checker goes beyond basic scans to give you a complete view of your email reputation. Key features include:
- Multi-database scanning across 50+ major spam blacklists
- Instant, readable reports with flagged issues and suggested next steps
- CDN and shared IP detection, so you know whether a listing actually impacts you
- MX and DNS record analysis to identify mail server and domain-level risks
- A single, easy-to-understand report — no technical decoding required
Key Spam Databases Covered
Our email blacklist checker scans over 50 widely used spam databases. Some of the most impactful include:
- Uceprotectl1: Flags individual IP addresses based on recent abuse reports. If your IP shows suspicious behavior or is misused even briefly, it may appear here.
- Uceprotectl2: Escalates from level 1 by blacklisting entire IP ranges (/24). Even if you’re not sending spam emails, another sender on your subnet could put you at risk.
- Uceprotectl3: The most aggressive level, targeting entire hosting providers with poor overall reputation. If your email provider’s network is listed, you’re affected too.
- Sem Fresh: A real-time blacklist from Spam Eating Monkey that catches IPs and domains involved in recent or active spam campaigns, often before traditional lists do.
- Invaluement: Frequently used by internet service providers and corporate spam filters to block low-quality or mass-marketing emails. Listings are typically based on reputation and spam trap activity.
- Lashback: Focuses on complaints related to opt-out violations. If recipients report your emails as unwanted after unsubscribing, you may appear on this list.
- Passive spam block list: A passive DNSBL that observes live email behavior to identify spammers. This list is fast to update and can catch issues that slip past authentication checks.
- Barracuda blacklist: Used by Barracuda Networks’ security appliances. A listing here can significantly harm your domain reputation.
- abuse.ro blacklist: Targets IPs involved in malware distribution, phishing, or unauthorized access attempts. Often flags compromised servers or outdated infrastructure.
- Spamcop check: Based on user submissions and spam trap data, Spamcop is widely used by ISPs and anti-spam tools to block recent offenders.
- Sorbs spam: A family of DNSBLs covering dynamic IPs, open relays, hijacked servers, and more. Even small misconfigurations can lead to listings here.
- Spamhaus Zen: Considered the most trusted of the major blacklists. It combines multiple datasets to block known spam sources, insecure email servers, and poor domain reputation. Includes IP addresses used by spammers and abusers in unsolicited bulk email or other types of Internet-based abuse that threaten networks or email users.