Being on a blacklist (DNSBL) means some receivers block or filter your mail. Removal is usually possible, but only after the cause is fixed — otherwise you will be listed again, often for longer.
Step 1: Find out where you are listed
Check your sending IP and your domain with the Blacklist Checker. Note which lists matter: Spamhaus, Microsoft and Barracuda affect delivery widely; many small lists have little effect.
Step 2: Fix the cause
- Compromised account or website — change passwords, remove malicious scripts, check for unknown mail in your outbound queue
- Infected device on your network — common cause of Spamhaus XBL/CBL listings
- Bad list practices — purchased or old lists hitting spam traps
- Open relay — your server forwards mail for anyone; close it
- Dynamic or residential IP — Spamhaus PBL lists IP ranges that should not send directly; send through your provider's server instead
Step 3: Request removal
- Spamhaus — use the lookup at check.spamhaus.org; follow the removal link for the specific list
- Microsoft (Outlook/Hotmail) — use the sender support / delisting form linked in the bounce (S3150 errors)
- Barracuda — request removal at barracudacentral.org
- SpamCop — listings expire automatically about 24 hours after reports stop
- UCEPROTECT levels 2–3 — these list whole networks; ask your hosting provider
Step 4: Monitor
Set up blacklist monitoring so you are alerted when a new listing appears instead of finding out from bounces.
Frequently asked questions
How long does blacklist removal take?
From minutes (Spamhaus self-service after fixing) to days for manual reviews. Some lists expire automatically.
Should I pay for removal?
Reputable lists do not require payment for removal. Be careful with lists that demand a fee.
My IP is on a list nobody uses — does it matter?
Usually not. Focus on the lists that receivers you send to actually use.