How to Remove Your Domain from Email Blacklists

Email blacklists (also called DNSBLs or RBLs) are databases of IP addresses and domains known to send spam or malicious email. When your domain or sending IP lands on a blacklist, receiving mail servers may reject your messages outright or route them to spam. This can cripple your business communication, marketing campaigns, and transactional emails. The good news: most blacklists have a clear delisting process, and with the right steps you can restore your sending reputation.

Step 1: Identify Which Blacklists You Are On

Before you can fix the problem, you need to know exactly where you are listed. There are over 100 active blacklists, but the ones that matter most are those used by major email providers. The most impactful blacklists include:

• Spamhaus (SBL, XBL, PBL, DBL) — The most widely used blacklist. Being listed here affects deliverability to nearly every major email provider.
• SpamCop — Focuses on IP addresses that have recently sent spam. Auto-delists when spam stops.
• Barracuda (BRBL) — Used by organizations running Barracuda spam filters.
• SORBS — Lists IPs involved in spam, open relays, and open proxies.
• SURBL / URIBL — Lists domains found in spam message bodies and URLs.

Use the Email Armory Blacklist Checker to query your domain and sending IP against all major blacklists in one step. Also check your MX server IPs separately, as they can be listed independently from your domain.

Step 2: Find the Root Cause

Blacklists do not list domains or IPs randomly. There is always an underlying reason, and submitting a delisting request without fixing the cause will result in immediate re-listing. Common root causes include:

• Compromised email account — An attacker gained access to a mailbox and used it to send spam. Check your mail server logs for unusual sending patterns, login attempts from unexpected locations, or a single account sending thousands of messages.
• Open relay — Your mail server accepts and forwards email from any sender to any recipient. This is a critical misconfiguration that spammers actively scan for.
• Malware or botnet infection — A server on your network is infected and sending spam without your knowledge. Run security scans on all machines on your network.
• Purchased or scraped email lists — Sending to recipients who never opted in generates spam complaints that trigger blacklisting.
• High bounce rate — Sending to many invalid addresses signals poor list hygiene, which some blacklists interpret as spammer behavior.
• Shared hosting IP — Another user on the same IP address sent spam. This is common on shared hosting and shared sending services.

Review your mail server logs, check for unauthorized access, and run a Spam Score test on your outgoing emails to identify content or configuration issues contributing to the problem.

Step 3: Fix the Underlying Issue

Once you have identified the root cause, take corrective action before requesting delisting:

• Compromised accounts: Reset passwords for all affected accounts. Enable two-factor authentication. Review and revoke any suspicious app passwords or OAuth tokens.
• Open relay: Configure your mail server to only relay for authenticated users and authorized domains. Test with an open relay checker to confirm it is closed.
• Malware: Isolate infected machines, run full antivirus scans, and apply all security patches. Consider reimaging severely compromised systems.
• List hygiene: Remove all bounced addresses, unsubscribes, and complaints from your mailing lists. Implement double opt-in for new subscribers.
• Shared IP: Contact your hosting provider to request a new IP or move to a dedicated IP address. If you use a shared email service, contact their abuse team.

Step 4: Submit Delisting Requests

With the root cause fixed, you can now request removal from each blacklist. Each blacklist has its own process:

Spamhaus

1. Go to the Spamhaus Blocklist Removal Center at lookup.spamhaus.org.
2. Enter your IP address or domain to see your listing details.
3. Follow the instructions specific to the list you are on (SBL, XBL, DBL, etc.).
4. For SBL listings, submit a removal request explaining what caused the listing and what you have done to fix it.
5. XBL listings are typically automatic and resolve once the infected machine is cleaned.

SpamCop

1. SpamCop listings are automatic and time-based. Once spam from your IP stops, the listing expires within 24 to 48 hours.
2. There is no manual delisting process. Focus on stopping the spam.
3. Check your status at spamcop.net/bl.shtml to monitor progress.

Barracuda (BRBL)

1. Visit barracudacentral.org/lookups and enter your IP address.
2. If listed, click the removal request link.
3. Fill out the form explaining the corrective actions you have taken.
4. Requests are typically processed within 12 to 24 hours.

SORBS

1. Look up your IP at www.sorbs.net.
2. Follow the specific delisting instructions for the zone you are listed in.
3. Some SORBS zones require a manual delisting request; others delist automatically.

Step 5: Monitor After Delisting

Getting delisted is not the end of the process. You need to actively monitor your sending reputation to catch any re-listing early:

• Run the Blacklist Checker weekly for the first month after delisting. If you get re-listed, the root cause was not fully resolved.
• Use the Spam Score tool to analyze your outgoing emails and ensure they are not triggering spam filters.
• Monitor your bounce rates and spam complaint rates. A complaint rate above 0.1% is a warning sign.
• Set up Google Postmaster Tools if you send significant volume to Gmail recipients. It provides visibility into your domain and IP reputation.

Step 6: Prevent Future Blacklisting

The best strategy is to never get blacklisted in the first place. Implement these preventive measures:

• Authenticate your email: Set up SPF, DKIM, and DMARC for every domain you send from. Use our DMARC Generator to create a policy that protects your domain from spoofing.
• Maintain clean email lists: Use double opt-in, promptly remove bounces and unsubscribes, and never purchase email lists.
• Secure your infrastructure: Keep all software patched, disable open relay, enforce strong passwords, and enable two-factor authentication on all email accounts.
• Monitor sending volume: Sudden spikes in outgoing email volume are a red flag for blacklists. Ramp up sending gradually when onboarding new campaigns.
• Use feedback loops: Register with ISP feedback loop programs (available from Yahoo, Outlook, and others) to receive notifications when recipients mark your email as spam.
• Regular blacklist checks: Schedule weekly checks with the Blacklist Checker to catch listings before they impact your deliverability.

Frequently Asked Questions

How do I know if my domain is on an email blacklist?

Use a blacklist checking tool to query your domain or sending IP address against dozens of known DNS-based blackhole lists (DNSBLs). Common signs of blacklisting include a sudden drop in email deliverability, bounce messages referencing a specific blacklist, or recipients reporting that your emails go straight to spam.

How long does it take to get delisted from a blacklist?

Delisting times vary by blacklist. Some like SpamCop automatically delist within 24 to 48 hours once spam stops. Others like Spamhaus require a manual delisting request and may take 1 to 7 days. Barracuda typically processes requests within 12 to 24 hours. The key factor is that the underlying issue must be resolved first — blacklists will not delist (or will quickly re-list) if the problem persists.

Can I prevent my domain from being blacklisted?

Yes. Implement SPF, DKIM, and DMARC authentication for your domain. Keep your email lists clean by removing bounced addresses. Never purchase email lists. Secure your mail server against open relay and compromised account abuse. Monitor your sending reputation regularly using blacklist checking tools. These practices significantly reduce the risk of blacklisting.

What is the difference between a domain blacklist and an IP blacklist?

An IP blacklist (such as Spamhaus SBL or Zen) lists the IP addresses of servers known to send spam. A domain blacklist (such as Spamhaus DBL or SURBL) lists domain names found in spam messages, either as the sender domain or in URLs within the message body. You can be listed on one or both types. Check both your sending IP and your domain to get a complete picture.

Related Guides

• How to Set Up an SPF Record
• How to Set Up DKIM Records
• How to Set Up DMARC
• How to Improve Email Deliverability