Complete guide to checking blacklist status and getting your domain or IP removed from major email blacklists.
Published: 2026-01-22 | Updated: 2026-01-22 | Read time: 8 min
Key Takeaways
Not all blacklists matter equally—focus on major ones like Spamhaus and Barracuda
Most listings require fixing the root cause before requesting removal
Removal timeframes vary from instant (Barracuda) to 24+ hours (Spamhaus)
IP blacklists are more severe than domain blacklists
Microsoft uses SNDS and sender.office.com for their separate delisting process
Set up monitoring to catch new listings before they impact delivery
What Are Email Blacklists?
Email blacklists are databases of IP addresses and domains known to send spam. When you're on a blacklist, email providers block or filter your messages before they reach the inbox.
Why Blacklists Exist
Blacklists protect email users from spam and phishing. They're maintained by:
Anti-spam organizations (Spamhaus, SpamCop)
Email security companies (Barracuda, Proofpoint)
Email providers (Microsoft, Google internal lists)
Signs You're Blacklisted
Emails bounce with "blocked" or "rejected" messages
Sudden drop in deliverability
Recipients report not receiving your emails
MailRisk scan shows blacklist warnings
Bounce messages mention specific blacklists
The Impact
| Blacklist Type | Impact Level |
|----------------|--------------|
| Major (Spamhaus, Barracuda) | Severe—most emails blocked |
| Medium (SpamCop, SORBS) | Moderate—some providers block |
| Minor (smaller lists) | Limited—few providers use them |
Getting blacklisted is serious, but it's fixable. This guide walks you through checking and removal.
How to Check Your Blacklist Status
Quick Check with MailRisk
Scan your domain with MailRisk to check common blacklists as part of your overall deliverability assessment.
Comprehensive Check with MXToolbox
For a thorough check across 100+ blacklists:
1. Go to mxtoolbox.com/blacklists.aspx
2. Enter your domain or IP address
3. Review results for any listings
Your sending IP — The IP address of your email server
Your domain — yourdomain.com
Your mail server hostname — mail.yourdomain.com
Finding Your Sending IP
Check email headers from emails you've sent:
1. Open a sent email in Gmail
2. Click three dots → "Show original"
3. Look for "Received: from" with an IP address
Or ask your email provider for your dedicated/shared sending IP.
Major Blacklists & How to Get Removed
Spamhaus (Most Critical)
Spamhaus is the most influential blacklist. Being listed here severely impacts deliverability.
Lists they maintain:
SBL — Spam sources
XBL — Exploited hosts (malware, open proxies)
PBL — Policy Block List (IPs that shouldn't send email directly)
DBL — Domain-based blocklist
Removal process:
1. Go to check.spamhaus.org
2. Enter your IP or domain
3. If listed, click the listing for details
4. Follow the removal form link
5. Explain what caused the issue and what you've fixed
6. Submit and wait 24-48 hours
Important: Spamhaus requires you to fix the root cause first. Repeat listings result in longer blocks.
Barracuda Central
Popular with enterprise email filters.
Removal process:
1. Go to barracudacentral.org/lookups
2. Check your IP
3. If listed, click "Request Removal"
4. Fill out the removal form
5. Usually processed within 12-24 hours
SpamCop
User-reported spam complaints.
Removal process:
1. SpamCop listings expire automatically after 24-48 hours without new reports
2. If persistent, visit spamcop.net/bl.shtml
3. Check your IP and review the complaint history
4. Stop the behavior generating complaints
Note: SpamCop doesn't accept removal requests—you must stop the spam reports.
Other Common Blacklists
SORBS (Spam and Open Relay Blocking System)
Removal process:
1. Check at sorbs.net
2. Free delisting available for some lists
3. Paid "express" delisting available ($50)
4. Some lists require waiting period
UCEPROTECT
Three levels of listing (1, 2, 3):
Level 1: Your specific IP
Level 2: Your IP range
Level 3: Your provider's entire network
Removal:
Level 1 expires automatically after 7 days
Paid express removal available
Levels 2-3 require contacting your hosting provider
Microsoft/Outlook SNDS
Microsoft maintains their own internal lists.
Removal process:
1. Sign up for SNDS
2. Verify ownership of your IP range
3. Monitor your reputation
4. Submit mitigation request if blocked
Google Postmaster
Google doesn't publish a public blacklist but tracks sender reputation.
Monitoring:
1. Sign up at postmaster.google.com
2. Verify your domain
3. Monitor reputation dashboards
4. Poor reputation = spam folder, not hard blocks
Microsoft Outlook & Hotmail Delisting
Microsoft maintains separate filtering systems from public blacklists. If you're blocked by Outlook.com, Hotmail, or Live.com, the process is different.
Signs You're Blocked by Microsoft
Bounce codes: 550 5.7.1, 550 5.7.606, 550 5.7.708
Emails to @outlook.com/@hotmail.com bounce or go to Junk
SNDS shows red/blocked status for your IP
Microsoft SNDS Registration
1. Go to sendersupport.olc.protection.outlook.com/snds/
2. Sign in with a Microsoft account
3. Request access for your sending IP range
4. Verify ownership via email or DNS
5. Monitor your reputation status (green/yellow/red)
Delisting via sender.office.com
1. Go to sender.office.com
2. Click "Troubleshoot" or "Delisting"
3. Enter your blocked IP address
4. Explain what caused the issue and what you've fixed
5. Submit and wait 24-48 hours
Junk Email Reporting Program (JMRP)
Set up JMRP to receive spam complaints from Outlook users:
1. Register in SNDS first
2. Request JMRP access at the SNDS portal
3. Specify an email to receive complaint copies
4. Use complaints to identify and remove problem recipients
Outlook.com vs Exchange Online
| Service | Who uses it | Your recourse |
|---------|-------------|---------------|
| Outlook.com/Hotmail | Consumers | sender.office.com + SNDS |
| Exchange Online (M365) | Businesses | Limited; often recipient IT controls |
For a complete guide to Microsoft-specific delisting, see our dedicated Outlook Blacklist Removal Guide.
Removal Best Practices
Before Requesting Removal
1. Identify the root cause — Why were you listed?
2. Fix the problem — Remove the issue before requesting removal
3. Document your fix — Be ready to explain what you changed
4. Wait 24 hours — Let your changes propagate
Common Causes & Fixes
| Cause | Fix |
|-------|-----|
| Compromised account | Change passwords, enable 2FA, scan for malware |
| Open relay | Secure your mail server configuration |
| Spam complaints | Remove complainers, improve list hygiene |
| Malware | Clean infected systems, check for bots |
| Purchased list | Stop using it, build organic list |
| High bounce rate | Clean your email list, verify addresses |
Writing a Good Removal Request
Include:
Your IP/domain
What caused the listing
Specific steps you've taken to fix it
Your commitment to preventing recurrence
Example:
> "Our IP 192.0.2.1 was listed due to a compromised user account sending spam. We've reset all credentials, enabled 2FA, scanned for malware, and removed the offending account. We've also implemented sending limits and improved monitoring. We're committed to maintaining good sending practices."
After Removal
1. Monitor closely — Check blacklists weekly
2. Implement safeguards — Prevent recurrence
3. Set up alerts — Use monitoring services
4. Document the incident — Learn from it
How to Prevent Future Blacklisting
Technical Safeguards
1. Proper authentication
- SPF record listing only authorized servers
- DKIM enabled for all sending services
- DMARC with enforcement policy
2. Secure infrastructure
- No open relays
- Strong passwords + 2FA
- Regular malware scans
- Firewall properly configured
3. Sending limits
- Rate limiting per user
- Outbound filtering for spam patterns
- Alerts for unusual sending patterns
List Management
1. Never buy email lists — #1 cause of blacklisting
2. Use double opt-in — Verify subscriber consent
3. Clean regularly — Remove bounces and unengaged
4. Monitor complaints — Remove complainers immediately
Monitoring Setup
| What to Monitor | Tool | Frequency |
|-----------------|------|-----------|
| Blacklist status | MXToolbox, MailRisk | Weekly |
| Spam rate | Google Postmaster Tools | Daily |
| Bounce rate | Your ESP | Per campaign |
| Reputation | Microsoft SNDS | Weekly |
Warning Signs
Watch for these indicators before you get blacklisted:
Rising bounce rates
Increasing spam complaints
Decreasing open rates
Unusual sending patterns
Security alerts from your provider
Frequently Asked Questions
How long does removal take?
| Blacklist | Typical Time |
|-----------|--------------|
| Spamhaus | 24-48 hours after fix |
| Barracuda | 12-24 hours |
| SpamCop | Auto-expires in 24-48h |
| SORBS | 24h - 1 week |
| UCEPROTECT | 7 days (auto) or instant (paid) |
I'm on multiple blacklists. Should I request removal from all?
Focus on the major ones first (Spamhaus, Barracuda). Minor blacklists have limited impact. Fix the root cause first—some lists will auto-remove once the problem stops.
Why did I get listed again after removal?
The root cause wasn't fixed. Blacklists track repeat offenders and apply longer blocks. You must identify and fix the actual problem.
My ESP says their IP is blacklisted. What do I do?
Contact your ESP's support—it's their responsibility to manage their sending IPs. Consider a dedicated IP if this is a recurring problem.
Can I use a different IP to bypass blacklists?
Technically yes, but the problem follows you. If your practices don't change, the new IP will be blacklisted too. Fix the root cause.
Is there a way to check blacklists automatically?
Yes—services like MXToolbox Monitoring, HetrixTools, and others offer automatic monitoring with alerts when you're listed.