Check Your Mail Server IP and Blacklist Status
Find the mail servers associated with a domain and determine which IP addresses need further reputation checks. This page may show a preliminary mail-server lookup; it is not a completed 100+ blacklist scan unless actual DNSBL results are displayed. This page does not display DNSBL results. Run the full email blacklist checker.
Preliminary mail-server lookup. Not a completed blacklist scan.
What is an email IP blacklist?
A DNS-based blocklist (DNSBL) publishes information about IP addresses or domains associated with suspicious or unwanted email activity. Different lists have different criteria and coverage. A listing is not proof that every message from the IP will be blocked, and absence from one list is not proof of good deliverability.
How do I check the right IP address?
The MX records for your domain identify servers that receive mail. Your outgoing email may use entirely different infrastructure. To investigate outbound deliverability, identify the actual sending IP from a message header or your email service provider before checking it against supported blocklists.
What should I do if the sending IP is listed?
Identify the list and its published reason, verify that the IP belongs to your sending infrastructure, and resolve the underlying cause such as a compromised account or abusive sending. Follow that list operator's official remediation process. Never assume that changing SPF or DMARC alone removes an IP from a DNSBL.
Why Email IPs Get Blacklisted
Sending spam (intentional or compromised)
If your server sends spam-whether intentionally or because accounts were compromised-blacklists will add your IP. Secure your server and audit outbound mail.
Hitting spam traps
Spam traps are email addresses that should never receive mail. Sending to them indicates poor list hygiene or purchased lists. Clean your email list regularly.
High bounce rates
Sending to many invalid addresses signals poor list quality. Remove bounced addresses immediately and use email verification before sending.
Shared IP reputation
If you're on shared hosting or a shared IP pool, another sender's bad behavior can get the IP blacklisted. Consider a dedicated IP for important mail.
Open relay or misconfiguration
An open relay allows anyone to send mail through your server. Spammers exploit this. Ensure your mail server requires authentication.
New IP without warmup
New IPs have no reputation. Sending high volumes immediately looks suspicious. Warm up new IPs gradually over weeks.
How to Get Delisted from Blacklists
Identify the Problem
Check why you were listed. Most blacklists provide a reason (spam, open relay, etc.). Fix the root cause first.
Stop the Spam
If compromised accounts are sending spam, reset passwords, enable 2FA, and audit your mail queue.
Request Delisting
Visit each blacklist's website and follow their delisting process. Some auto-delist after a period; others require manual request.
Wait for Propagation
Delisting can take hours to days. Some blacklists have waiting periods before allowing delisting requests.
Monitor Continuously
Set up monitoring to catch future listings early. Getting relisted after delisting is harder to recover from.
Frequently Asked Questions
How do I check if my IP is blacklisted?
The MX records for your domain identify servers that receive mail. Your outgoing email may use entirely different infrastructure. To investigate outbound deliverability, identify the actual sending IP from a message header or your email service provider before checking it against supported blocklists. This page may show a preliminary mail-server lookup; it is not a completed 100+ blacklist scan unless actual DNSBL results are displayed. This page does not display DNSBL results.
How do I get delisted from a blacklist?
Identify the list and its published reason, verify that the IP belongs to your sending infrastructure, and resolve the underlying cause such as a compromised account or abusive sending. Follow that list operator's official remediation process. Never assume that changing SPF or DMARC alone removes an IP from a DNSBL.
Why is my IP blacklisted?
A DNS-based blocklist (DNSBL) publishes information about IP addresses or domains associated with suspicious or unwanted email activity. Different lists have different criteria and coverage. A listing is not proof that every message from the IP will be blocked, and absence from one list is not proof of good deliverability.
Monitor Blacklist Status 24/7
Create a free account to get instant alerts when your IP gets blacklisted and track delisting progress.
Start Free Monitoring