If your IP address or domain is on an email blacklist, your emails will be blocked or sent to spam by millions of mail servers worldwide. This guide gives you direct links to request removal from every major blacklist, plus instructions on how to stay off them.
How Email Blacklists Work
Email blacklists (also called DNSBLs or RBLs) are databases of IP addresses and domains that have been reported for sending spam. When you send an email, the receiving server checks your IP against these lists. If you're on one, your email is blocked or marked as spam.
Spamhaus, Barracuda
SpamCop, SORBS
UCEPROTECT, JustSpam
Major Blacklists & Removal Instructions
Spamhaus SBL / XBL / PBL
CRITICAL SEVERITYSpamhaus is the most widely-used blacklist. Being listed here essentially blocks your email from most corporate inboxes.
- Go to the Spamhaus IP lookup tool
- Enter your IP address and click "Lookup"
- If listed, click the removal link for your specific listing
- Fill out the removal request form with your details
- Removal typically takes 24–48 hours
Barracuda Reputation Block List
CRITICAL SEVERITYBarracuda's BRBL is heavily used by businesses using Barracuda spam filters.
- Visit the Barracuda removal request page
- Enter your IP address
- Provide your email and reason for delisting
- Submit — removal is usually automatic within 12 hours
SpamCop
HIGH SEVERITYSpamCop automatically expires listings 24 hours after the last spam report. The best fix is to stop whatever triggered the reports.
- No manual removal available
- Listings expire 24–48 hours after the last report
- Focus on fixing the root cause (sending to bad lists, etc.)
SORBS
MEDIUM SEVERITYSORBS has multiple lists for different offense types. Some auto-expire, others require manual removal.
- Look up your IP on SORBS
- Identify which list you're on
- Follow the specific removal process for that list
UCEPROTECT
MEDIUM SEVERITYUCEPROTECT has three levels. Level 1 (your IP) auto-expires in 7 days. Levels 2–3 affect IP ranges and are harder to remove.
- Level 1: Wait 7 days or pay for express removal
- Level 2–3: Contact your hosting provider
How to Stay Off Blacklists
- ✓Set up SPF, DKIM, and DMARC — properly authenticated emails are rarely blacklisted
- ✓Never buy email lists — purchased lists contain spam traps
- ✓Use double opt-in — confirm subscribers actually want your email
- ✓Monitor bounce rates — keep below 2%
- ✓Include easy unsubscribe — reduce spam complaints
- ✓Warm up new IPs slowly — don't blast 10K emails day one