IS YOUR DOMAIN OR IP
ON AN EMAIL BLACKLIST? Decorative underline

Being blacklisted kills your email deliverability before your message even reaches the inbox.

Check your domain or IP against 40+ major blacklists including Spamhaus ZEN, Barracuda, SORBS, SURBL, and SpamCop - instantly and for free.

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Blacklists We Check

■ Spamhaus ZEN
■ Barracuda
■ SORBS
■ SURBL
■ SpamCop
+ 35+ more lists

How Blacklisting Silently
Kills Your Deliverability

You don't get a warning when you land on a blacklist. Your emails just stop arriving. Sales leads go cold. Support tickets pile up unanswered. And you have no idea why.

Blocked emails Major mail providers like Gmail and Outlook silently block or filter blacklisted senders
Brand damage Even legitimate transactional emails like password resets may never reach users
Reputation damage Blacklist listings damage your sender reputation and can take days or weeks to resolve

Common Reasons Domains Get Blacklisted

  • ● Spam complaints - too many recipients marking your emails as spam triggers automated blacklisting
  • ● Open relay - a mail server configured as an open relay can be exploited by spammers, getting your IP listed
  • ● Compromised accounts - if one email account on your domain is hacked and sends spam, your entire domain can be affected
  • ● Buying email lists - sending to purchased lists almost always results in spam traps and blacklisting
  • ● Shared hosting - if you share an IP with other senders, their bad behavior can affect your sender reputation

Why Choose DMARCFlow's Blacklist Checker

Comprehensive coverage, instant results, actionable guidance.

40+ blacklists
40+ Blacklists Checked

Checks all major DNSBLs and RBLs in a single query - Spamhaus, Barracuda, SORBS, SURBL, SpamCop and many more.

Domain and IP
Domain & IP Support

Check both domain names and IP addresses - covering all sending infrastructure used by your email system.

Instant results
Instant Results

Real-time checks with per-blacklist pass/fail status so you know exactly which list you're on and why it matters.

Delisting guidance
Delisting Guidance

Direct links to delisting forms for each blacklist so you can start the removal process immediately.

Blacklisted vs. Clean -
The Deliverability Gap Is Enormous

Understand what you're risking by not monitoring your sender reputation.

BLACKLISTED
Emails rejected by major providers Transactional emails silently dropped Sender reputation severely damaged Days or weeks to get delisted No way to know you're listed without checking
CLEAN WITH DMARCFLOW
Verified clean sender reputation All major blacklists checked in one scan Immediate notification if listed Direct delisting links for fast removal Higher inbox placement rates DMARC + SPF + DKIM coverage alongside Free, instant, no account required

Your sender reputation is your most valuable email asset.
Protect it starting now.

Frequently Decorative underline Asked
Questions

Everything you need to know about email blacklists

A DNSBL (DNS-Based Blackhole List) or RBL (Real-time Blackhole List) is a database of IP addresses and domain names associated with spam, malware distribution, or other abusive sending behavior. Mail servers worldwide query these lists to decide whether to accept, reject, or flag incoming email. Being listed on a major DNSBL can cause a significant portion of your email to never reach recipients.

The process varies by blacklist. Generally: first fix the underlying issue (stop spam, close open relays, secure compromised accounts), then visit the blacklist operator's website and submit a delisting request. Some lists delist automatically after a period of clean behavior. Others require manual review. Our checker provides direct links to each blacklist's removal process.

Spamhaus ZEN combines three lists: the SBL (Spamhaus Blocklist) covers IPs with confirmed spam sources, the XBL (Exploits Blocklist) covers IPs sending exploited or hijacked traffic, and the PBL (Policy Blocklist) covers IPs that should not be sending direct-to-MX email (like consumer broadband). ZEN queries all three simultaneously, making it the most comprehensive single check.

Ideally both. Domain-based blacklists (like SURBL and URIBL) list domain names found in spam email bodies or headers. IP-based blacklists (like Spamhaus ZEN and SpamCop) list the IP addresses that are actually sending spam. If you use a dedicated sending IP, check that IP. If you use shared hosting or a cloud email service, your provider's IPs may already be monitored on your behalf.

For active email senders, checking weekly is a good baseline. If you send high volumes of email or run email marketing campaigns, consider daily monitoring. With DMARCFlow's continuous monitoring plan, you get automatic alerts as soon as any blacklisting is detected - so you can act before it impacts delivery.

Yes, indirectly. A strong DMARC policy (p=reject) prevents spammers from spoofing your domain in the From: header, which reduces the chance of your domain being blamed for spam it didn't send. SPF and DKIM also help authenticate your legitimate sending infrastructure. Together, these protocols signal trustworthiness to receiving mail servers and reduce spam complaints - the primary trigger for blacklistings.