MXToolbox Blacklist Check: Check Many Blacklists at Once

MXToolbox Blacklist Check

An MXToolbox blacklist check queries dozens of DNS blacklists at once for your domain or IP and shows which have listed you, in a single lookup.

Why people use MXToolbox

It's the common go-to because it checks many lists in one pass rather than one at a time, and it also surfaces related DNS and mail-server diagnostics. For a fast "am I listed anywhere" answer, it's a reasonable first stop.

What to do with the result

Focus on the listings that carry weight, Spamhaus above all, rather than every minor list. A listing on an obscure blacklist may not affect delivery, while a Spamhaus listing affects it everywhere. For Outlook-specific problems, run the microsoft blacklist check as well.

Monitoring instead of spot-checking

A one-off check tells you today's status. Nitrosend monitors DNSBLs continuously through Spamhaus DQS and alerts on degradation, so you learn about a problem when it starts rather than the next time you happen to run a lookup.

FAQ

What is an MXToolbox blacklist check?

A lookup that queries many DNS blacklists at once for your domain or IP and reports which have listed you, along with related mail-server diagnostics.

Which blacklist result should I worry about?

Prioritise major lists like Spamhaus, which affect delivery broadly. Minor-list listings often have little practical impact.