A DNS-based Blackhole List is a database of IP addresses that have been reported as sources of spam.

Why am I on a blacklist?

You might be sending spam, your server might be compromised, or you might be sharing an IP with a bad sender.

How do I get off a blacklist?

You must visit the website of the list provider and follow their specific "delisting" or "removal" instructions.

It varies from minutes to several days depending on the provider and the severity of the issue.

No. Major lists like Spamhaus and Barracuda have a massive impact, while smaller ones may be ignored by most providers.

If you use a service like Mailchimp or Gmail, you share IPs with other users. If one user spams, the whole IP can be listed.

Yes, some lists track domain reputation (SURBL/DBL) instead of IP reputation.

No, reputation is only one part of the puzzle. Engagement and authentication are also critical.

The Blacklist Checker scans over 100 major DNS-based Blackhole Lists (DNSBLs) to see if your IP address or domain is flagged as a source of spam.

AI-written reply suggestions

Automated follow-up sequences

Campaign open & click tracking

Unlimited connected accounts

The Blacklist Checker scans over 100 major DNS-based Blackhole Lists (DNSBLs) to see if your IP address or domain is flagged as a source of spam.

AI-written reply suggestions

Automated follow-up sequences

Campaign open & click tracking

Unlimited connected accounts