How to Get Your Domain or IP Off an Email Blacklist

Blacklists (also called blocklists or RBLs/DNSBLs) are databases of IP addresses and domains associated with spam. Mail servers query them in real time, and a listing on a major one can block a large share of your email. The good news: most listings can be removed within hours to days once the underlying problem is fixed.

Step 1: Confirm which lists you are on

Run a blacklist check for both your sending IPs and your domain. IP lists (such as Spamhaus ZEN, Barracuda, SpamCop) and domain lists (such as Spamhaus DBL, SURBL, URIBL) work differently, and each has its own removal process. Not every list matters equally — a listing on Spamhaus affects far more mail than one on a small, rarely used list.

Step 2: Find and fix the root cause

Requesting removal without fixing the cause almost always results in a quick relisting — and repeat offenders get delisted more slowly. Common causes:

• A compromised mailbox or website sending spam (check outbound logs and reset passwords)
• Malware on a device in your network (typical for Spamhaus XBL/CBL listings)
• Sending to purchased or old lists that contain spam traps
• An open relay or misconfigured mail server
• Your domain appearing in links inside spam sent by someone else (domain lists)
• A dynamic/residential IP sending mail directly (Spamhaus PBL — the fix is to send through a proper mail server)

Step 3: Request delisting

• Spamhaus: use the lookup and removal tool on the Spamhaus website; most self-service removals are processed quickly once the issue is resolved
• Barracuda: submit a removal request through the Barracuda Central form
• SpamCop: listings expire automatically, typically within 24 hours after reports stop
• Others: our check results include a delisting link for every list where you appear

Watch out for paid delisting

Reputable blacklists do not charge for removal. Be wary of any list that demands payment to delist you — its data is rarely used by major mailbox providers anyway.

Step 4: Prevent the next listing

• Use confirmed opt-in and remove bounces and inactive subscribers
• Enable SPF, DKIM and DMARC so others cannot easily abuse your domain
• Rate-limit outbound mail per account to contain a compromised mailbox
• Monitor blacklist status regularly instead of waiting for bounce messages