Email Blacklist Checker (RBL Lookup)

Check if your mail server's IP address is listed on major email blacklists. Being blacklisted can cause your emails to be rejected or marked as spam.

RBL / Email Blacklist Lookup

Check if a mail server IP is listed in DNS-based blacklists

Enter a mail server hostname or IP address above to check if it's listed in email blacklists.

What are Email Blacklists (RBLs)?

RBLs (Real-time Blackhole Lists) or DNSBLs (DNS-based Blackhole Lists) are databases of IP addresses known to send spam or malicious emails. Mail servers check these lists in real-time to decide whether to accept, reject, or flag incoming messages.

When your mail server's IP is listed on an RBL, receiving servers may reject your emails outright or deliver them to spam folders. This significantly impacts email deliverability for your entire domain.

Common Reasons for Being Blacklisted

•Sending spam: Intentionally or unintentionally sending unsolicited bulk emails
•Compromised server: Your mail server was hacked and used to send spam
•Open relay: Your server allows anyone to send email through it
•Infected users: Malware on your network sending spam through your mail server
•Shared IP reputation: Others on your shared hosting IP sent spam
•High bounce rates: Sending to many invalid email addresses

How to Get Removed from a Blacklist

1.
Identify the problem: Determine why you were listed. Check server logs for unusual activity, scan for malware, and verify your server isn't an open relay.
2.
Fix the issue: Secure your server, remove malware, close open relays, and clean up your mailing lists.
3.
Request removal: Visit each blacklist's website and follow their delisting process. Some require forms, others auto-delist after a period.
4.
Monitor: After delisting, continue monitoring to ensure you don't get relisted.

Blacklists We Check

SPFBL DNSBL

SPFBL DNS-based blackhole list for spam prevention

SpamCop

SpamCop blocking list for reported spam sources

SORBS DNSBL

Spam and Open Relay Blocking System

CBL Abuseat

Composite Blocking List for compromised hosts

Related Tools & Resources

SMTP Tools Email Authentication Guide DNS Lookup Tool DNS FAQ

Frequently Asked Questions

What is an RBL (Real-time Blackhole List)?▼

An RBL is a DNS-based list of IP addresses known to send spam. Mail servers query these lists in real time to decide whether to accept, reject, or flag incoming email. Popular RBLs include SpamCop, SORBS, Barracuda, and Spamhaus.

How do I check if my IP is blacklisted?▼

Enter your mail server's public IP address in the RBL lookup tool above. It queries multiple blacklists simultaneously and shows which ones list your IP. You can also run 'nslookup' against individual DNSBL zones manually.

How do I get my IP removed from a blacklist?▼

Each blacklist has its own delisting process. Typically you must fix the underlying spam issue (open relay, compromised account, etc.), then submit a delisting request through the blacklist provider's website. Most lists also have automatic expiry if no further spam is detected.

Why is my email going to spam even though I'm not blacklisted?▼

Blacklisting is only one factor. Missing or misconfigured SPF, DKIM, and DMARC records, poor sender reputation, lack of a reverse DNS (PTR) record, or sending from a shared IP with bad neighbors can all cause emails to land in spam folders.