Email Blacklist Checker — Is My Domain Blacklisted?
Check if your email domain, sending IP, or email address is listed on major spam blacklists including Spamhaus, Barracuda, SpamCop, URIBL, and SURBL. Free, instant, no signup required.
Blacklists We Check
| Blacklist | DNS Zone | Checks | Severity |
|---|---|---|---|
| Spamhaus ZEN | zen.spamhaus.org | IP | Critical |
| Barracuda BRBL | b.barracudacentral.org | IP | Warning |
| SpamCop | bl.spamcop.net | IP | Warning |
| UCEPROTECT-1 | dnsbl-1.uceprotect.net | IP | Warning |
| Abusix Combined | combined.mail.abusix.zone | IP | Warning |
| Mailspike | bl.mailspike.net | IP | Info |
| Backscatterer | ips.backscatterer.org | IP | Info |
| Spamhaus DBL | dbl.spamhaus.org | Domain | Critical |
| URIBL | multi.uribl.com | Domain | Warning |
| SURBL | multi.surbl.org | Domain | Warning |
How It Works
Enter your domain, IP, or email
The tool auto-detects whether you entered a domain name, IP address, or email address and routes the check accordingly.
MX records resolved
If you entered a domain or email, the tool resolves MX records to find the sending mail server IP addresses.
Parallel DNSBL queries
All IPs are checked against IP-based blacklists (Spamhaus, Barracuda, SpamCop, etc.) and the domain against domain-based lists (DBL, URIBL, SURBL).
Results & remediation
See which lists you're on, the severity of each listing, the reason, and direct links to request delisting from each operator.
Why Use MailCannon Blacklist Checker?
10 major blacklists
Spamhaus ZEN, Barracuda, SpamCop, UCEPROTECT, Abusix, Mailspike, Backscatterer, Spamhaus DBL, URIBL, and SURBL.
IP & domain checks
Checks both your sending IPs (via MX records) and the domain itself against the appropriate blacklist types.
Severity scoring
Each listing is classified as critical, warning, or informational based on its impact on email deliverability.
Direct delisting links
Every listing includes a direct link to the blacklist operator's delisting or lookup page.
Instant results
All DNSBL queries run in parallel. Results typically arrive within a few seconds.
No signup required
The checker is free and works without an account. Rate limits apply to prevent abuse.
What Is an Email Blacklist?
An email blacklist (also called a blocklist or DNSBL — DNS-based Blackhole List) is a database of IP addresses or domains that have been identified as sources of spam, malware, or abusive email. Mail providers like Gmail, Outlook, and Yahoo consult these blacklists in real time when receiving email. If the sender's IP or domain is listed, the email may be rejected outright or routed to the spam folder.
DNSBL checking works through a clever DNS trick: to check if IP 192.0.2.50 is on Spamhaus, the system reverses the octets (50.2.0.192), appends the blacklist zone (50.2.0.192.zen.spamhaus.org), and performs a DNS lookup. A response means listed; no response means clean.
What to Do If You're Blacklisted
- Don't panic. Most listings are fixable. Start by identifying which blacklist listed you and why.
- Fix the root cause. Compromised server? Secure it. Sending unsolicited email? Stop and clean your list. Residential IP? Use your ISP's mail server.
- Request delisting. Use the delisting links in your results. Each operator has their own process — some are automatic, others require manual review.
- Prevent relisting. Authenticate with SPF, DKIM, and DMARC. Keep your list clean. Honor unsubscribes. Monitor regularly.
- Re-check after 24-48 hours. Some listings expire automatically; others take longer. Keep monitoring.
Check Your Domain Now
Find out instantly if your email domain, IP, or email is on any major spam blacklist. Free, fast, and no signup required.
Check Blacklist