Email Blacklist Checker: Check Your Domain and IP

Email Blacklist Checker

An email blacklist checker tests whether your sending domain or IP appears on the DNS blacklists that mailbox providers use to filter spam.

What it checks

It runs your domain and IP against the major blacklists and reports each listing. Domain listings and IP listings are different problems: a domain can be listed for its content or reputation even when its IP is clean, so a thorough checker tests both.

Reading the result

A clean result doesn't guarantee good delivery, and a single minor listing isn't always fatal. What matters is which list. A blacklist checker ip focuses on the IP side, while domain listings usually trace to content, complaint rates, or compromised sending.

How Nitrosend prevents listings

Rather than checking after the fact, Nitrosend monitors DNSBL blocklists continuously via Spamhaus DQS and tracks spam-rate and per-provider placement trends, alerting on degradation before a listing lands. Every send is gated on the domain's health, so a slipping reputation gets caught early.

FAQ

What is an email blacklist checker?

A tool that checks whether your sending domain or IP is on the DNS blacklists mailbox providers use to filter spam, reporting each listing it finds.

Should I check my domain or my IP?

Both. A domain can be listed even when its IP is clean, and vice versa, so a full check tests both.