What is Blacklist Checker?
Blacklist Checker helps you determine if your IP address or domain is listed on any of the major DNS-based Blackhole Lists (DNSBL) used by email servers to block spam. Getting blacklisted can cause your emails to be rejected or marked as spam.
How It Works
The tool performs a reverse DNS lookup against 40+ major spam blacklists. When an IP is found on a blacklist, email servers receiving mail from your server may reject it.
What to Do If Listed
- Check the blacklist — Visit the blacklist website to understand why you're listed
- Request delisting — Most blacklists have a delisting process
- Fix the issue — Ensure you're not sending spam or running an open relay
- Wait for removal — Some lists auto-remove after a period
Key Features
- 40+ Blacklists — Checks against major spam databases
- Instant Results — See all results in seconds
- Listing Details — Shows why you're listed on each blacklist