Blacklist Checker: Check If Your Domain or IP Is Blacklisted
Scan your domain or IP against major DNSBL and RBL blacklists, detect reputation issues, and identify problems affecting email deliverability.
Results
- Free blacklist check
- Instant results
- No signup required
What does this blacklist checker analyze?
Run a complete blacklist scan and get a clear diagnosis of your reputation, blacklist status, and deliverability risk.
Blacklist lookup
Check your domain or IP across major DNSBL and RBL databases.
Reputation analysis
Evaluate domain and IP trust signals used by email providers.
Spam database detection
Identify listings across known anti-spam networks.
Blacklist source identification
See which providers flagged your domain or IP.
Blacklist errors and warnings
Detect suspicious activity, poor reputation, and risk indicators.
Deliverability impact
How blacklist listings affect inbox placement and email delivery.
Common Email Blacklists
Here are widely used blacklist providers that influence email deliverability.
Spamhaus
One of the most widely used spam blocklists.
Barracuda
Commonly used by enterprise email systems.
Spamcop
Tracks spam complaints and abuse reports.
SORBS
Monitors spam activity and open relays.
UCEPROTECT
Flags IP ranges with suspicious behavior.
Proofpoint
Enterprise-grade filtering and threat detection.
How Blacklists Work and Why They Matter
Blacklists (DNSBL / RBL) are databases that track domains and IPs associated with spam or suspicious email activity.
When an email is received, mailbox providers check your domain and IP against these lists. If listed, your emails may be filtered, delayed, or rejected entirely.
A clean blacklist status improves sender trust, while a listed domain or IP can significantly reduce inbox placement and damage reputation.
Blacklist checks are triggered during:
Example:
mailX Related Email Authentication Tools
Check, validate, and improve authentication and reputation signals affecting your deliverability.
Common Blacklist Issues This Tool Detects
Domain listed on blacklist
Your domain appears in spam databases.
IP address blacklisted
Your sending IP is flagged for suspicious activity.
Poor sender reputation
Low trust signals affect email delivery.
Spam activity detected
Sending patterns trigger spam filters.
High bounce rates
Invalid recipients damage reputation.
Abuse complaints
User reports increase blacklist risk.
Blacklist, Reputation & Deliverability Guides
Why Emails Go to Spam?
Emails can go to spam because of authentication issues, poor sender reputation, DNS mistakes, blacklist listings, or weak engagement.
Why Your Domain Gets Blacklisted
A domain gets blacklisted when monitoring organizations flag it for sending patterns that resemble spam.
Email Deliverability: The Complete Guide to Reaching the Inbox (2026)
Email deliverability refers to the ability of your emails to reach your recipient’s primary inbox rather than being filtered into spam...
Free Blacklist Checker to Verify Domain and IP Reputation
Use this blacklist checker to perform a DNSBL lookup and verify whether your domain or IP address is listed on spam blacklists.
Blacklists are used by mailbox providers to filter spam and protect users. If your domain or IP is listed, your emails are more likely to be blocked, rejected, or sent to spam.
This tool helps you check blacklist status, identify reputation issues, and understand what is impacting your email deliverability.
Blacklist Check Results
Status & Record
Blacklist status (listed / not listed) & detected blacklist providers
Analysis Summary
Domain reputation, IP reputation & risk level
Issues & Fixes
Detected problems & recommended fixes
Fix Your Email Deliverability with an Expert
Get a personalized audit of your domain reputation, blacklist status, and email setup. Identify what’s hurting your deliverability and get clear, actionable fixes in a 30-minute session.