Blacklist Checker
Check if your domain or IP is listed on email blacklists
Note: This tool checks against major DNS-based blacklists (DNSBL). Results are indicative. For production use, integrate with actual DNSBL APIs.
Blacklist Guide
What Are Blacklists?
Email blacklists (DNSBLs) are databases of IP addresses and domains known to send spam or malicious content. Email providers use them to filter incoming mail.
Common Reasons for Listing
- ✗ Sending spam or unsolicited emails
- ✗ Compromised accounts sending malware
- ✗ Open mail relays
- ✗ Poor email list hygiene
- ✗ High bounce/complaint rates
Prevention Tips
- ✓ Use double opt-in for email lists
- ✓ Implement SPF, DKIM, and DMARC
- ✓ Monitor sending reputation regularly
- ✓ Remove inactive subscribers
- ✓ Secure all email accounts
- ✓ Use dedicated IP for email sending