How to Get Removed from Email Blacklists

How Email Blacklists Work

Email blacklists are databases that track IP addresses and domains associated with spam. Mail servers query these databases when deciding whether to accept, filter, or reject incoming messages. A listing on a widely-referenced blacklist can effectively halt delivery to recipients whose providers check that list — not just reduce placement partially, but block delivery entirely.

The major lists serve different functions and check different things. Spamhaus is the most widely referenced blacklist and runs several sublists. The SBL (Spamhaus Block List) tracks known spam sources. The CBL (Composite Blocking List) tracks IPs exhibiting automated spam patterns. The DBL (Domain Block List) tracks sending domains and domains that appear in spam message bodies. A Spamhaus listing has the highest delivery impact of any blacklist — it is referenced by Gmail, Outlook, and most enterprise mail filters.

Barracuda (BRBL) maintains an IP reputation list used by Barracuda security appliances deployed in corporate mail environments. Barracuda listings primarily affect delivery to organizations running Barracuda gateways, which is common in mid-market and enterprise B2B companies. SpamCop is user-reporting based — when recipients report email through SpamCop-enabled clients, the sending IP is automatically listed. Listings expire automatically when reports stop arriving.

SURBL and URIBL work differently from IP and domain lists. They track domains that appear as links inside email bodies — not your sending domain, but any URL you link to in your message. A link to a domain on SURBL will cause the message to be filtered even if your sending infrastructure is clean. This is a common source of unexpected filtering that senders miss when they only check their sending domain and IP. IPs get listed through spam trap hits, high complaint rates, and sudden volume spikes from new infrastructure. Domains get listed through sustained poor sending behavior or association with spam content.

How to Check if You Are Listed

Check both your sending domain and your sending IP separately — they are listed independently, and you may be clean on one while listed on the other. For a comprehensive check, use MxToolbox's Blacklist Check tool, which queries over 100 lists simultaneously. MultiRBL.net covers additional lists MxToolbox does not include and is useful as a second pass. Run two checks: one for your sending domain (yourdomain.com) and one for your sending IP.

If you send through Amazon SES, your sending IP is an AWS IP in the SES pool, not an IP you own. Find your SES sending IP by inspecting the Received header in a test message, then check that IP against the major lists. Barracuda and Spamhaus SBL both affect SES delivery if the specific IP range is listed.

For SURBL and URIBL, the domain to check is any domain you link to in your email body — your website, your scheduling link, any URL you include. Run those domains through SURBL.org and URIBL.com lookups separately from your sending domain checks. A clean sending domain paired with a listed linked domain is a filtering problem that standard blacklist checks will not catch.

How to Get Delisted

Fix the root cause before submitting any removal request. Blacklist operators track repeat submissions, and requesting removal before fixing the problem results in relisting within days — which can lead to longer listing durations or refusal to delist on future requests.

Spamhaus SBL or DBL. Visit the Spamhaus lookup page and enter your IP or domain. If listed, the result page includes a removal link or instructions. Spamhaus requires you to explain what caused the listing and what has changed. For SBL listings, demonstrate you have cleaned your list, identified how spam traps were hit, and put safeguards in place. For CBL listings (automated spam patterns), the CBL provides self-service removal after you confirm the source has been resolved. Spamhaus typically responds within 24 to 48 hours.

Barracuda BRBL. Visit Barracuda Central's reputation lookup, enter your IP, and submit the self-service removal form with a brief explanation of what caused the listing and what has been resolved. Barracuda typically processes removals within 12 to 24 hours and monitors for relisting — if the same sending pattern resumes, the IP will be listed again quickly.

SpamCop. SpamCop listings expire automatically 24 to 48 hours after reports stop arriving. There is no manual removal process. The only path is stopping the activity that generates reports and waiting. If you keep getting relisted, recipients continue to report your emails — the problem is content, targeting, or complaint rate, not the listing mechanism itself.

SURBL / URIBL. If a domain you link to is listed, the fix depends on whether you control that domain. For your own domain, contact SURBL or URIBL via their websites to dispute the listing and document the correction. For a third-party domain (a scheduling tool, a tracking link), stop using that URL and replace it with an unlisted equivalent. SURBL removal requests are reviewed manually; realistic timelines are two to five business days. For all other lists, most maintain a lookup tool and removal instructions on their website. Prioritize Spamhaus, Barracuda, and SpamCop — they have the widest provider coverage and the highest delivery impact.

How to Avoid Getting Listed Again

Spam trap hits are the most common cause of cold email blacklistings. Traps come in two forms: pristine traps (addresses that have never been used for legitimate email, found only by scrapers) and recycled traps (formerly valid addresses reactivated as traps after inactivity). Verification before every campaign eliminates most pristine traps. Recycled traps are harder to catch — avoiding them requires not sending to very old lists or lists from sources that do not update address validity regularly.

High complaint rates result from recipients who do not recognize the sender, find the email irrelevant, or have no way to stop receiving it. Tighter targeting, a clear sender identity, and a reply-to-unsubscribe path reduce complaints. Keep complaint rates below 0.1% measured against sends — Google enforces this threshold explicitly for Gmail delivery, and most other providers use similar internal thresholds.

Volume spikes on new infrastructure trigger pattern-based listings. A domain that sends zero mail for two weeks and then sends 5,000 emails in a day exhibits a pattern consistent with spam infrastructure being activated for a campaign. Warmup on new accounts — gradual volume increase over two to four weeks — establishes legitimate sending history before campaigns start and prevents the spike pattern that flags new senders.

Ongoing monitoring is the last line of defense. Check your sending domain and IP against major lists at least weekly during active campaigns. A listing caught within 24 hours causes far less damage than one discovered after a week of degraded delivery. If your outreach tool includes blacklist monitoring in pre-send checks, use it — catching a listing before a campaign goes out is always better than discovering it from a drop in open rates.

How EmailQo Helps with Blacklist Monitoring

EmailQo includes blacklist monitoring as part of its pre-send checks. Before every campaign, the system checks your sending domains against major blacklists. If a listing is detected, the check flags it before emails go out, giving you time to investigate and request removal before the listing affects an active campaign.

Related Resources

• Domain Blacklisted? How to Fix and Prevent
• Sender Reputation Guide for Cold Email
• Cold Email Deliverability Guide 2026 | Own Infrastructure Approach