Free Tool
Email Blacklist Checker
Check if your domain's mail servers are listed on email blacklists. Monitors major DNS-based blacklists including Spamcop, Barracuda, and DroneBL.
What are Email Blacklists?
Email blacklists, also known as DNS-based Blackhole Lists (DNSBLs) or Real-time Blackhole Lists (RBLs), are databases of IP addresses and domains that have been identified as sources of spam or malicious email. Mail servers around the world query these lists in real time to decide whether to accept, reject, or flag incoming messages.
When your mail server's IP address appears on a blacklist, receiving servers may silently drop your emails, send them to spam folders, or reject them outright. This can devastate your email deliverability even if you are sending legitimate mail. Regularly checking your domain against these lists is a critical part of maintaining a healthy sender reputation.
Why Your Domain Might Get Blacklisted
- Sending spam or unsolicited bulk email
Sending to purchased lists or users who haven't opted in is the most common reason for blacklisting.
- Compromised mail server or account
Hackers can hijack your server or user accounts to relay spam without your knowledge.
- Shared hosting or IP reputation
If you share an IP address with other senders, their bad behavior can get your IP blacklisted too.
- Missing or misconfigured email authentication
Without proper SPF, DKIM, and DMARC records, your domain is more susceptible to spoofing and blacklisting.
- High bounce rate or spam trap hits
Sending to invalid addresses or spam traps signals poor list hygiene and can trigger blacklisting.
How to Get Delisted
Identify the root cause
Review your mail server logs and sending practices. Determine whether the issue is spam complaints, a compromised account, an open relay, or a shared IP problem.
Fix the underlying issue
Secure compromised accounts, close open relays, remove invalid addresses from your lists, and configure SPF, DKIM, and DMARC records properly.
Request removal from the blacklist
Most blacklist providers offer a self-service delisting process. Visit their website, submit a removal request, and explain the steps you have taken to prevent future issues. Some lists delist automatically after a cool-down period.
Monitor continuously
After delisting, keep monitoring your IPs and domain. Set up automated checks to catch new listings early before they damage your deliverability.
Monitor your domain reputation with our API
Automate blacklist monitoring, validate email addresses, and protect your sender reputation programmatically with the Mailchk API.