Free tool

Free email blacklist checker

Enter a sending domain to check current domain blocklists and sampled mail server IP blocklists before a cold email launch.

This checks domain and mail-server blacklist status for one domain. For a real launch verdict, run every domain, inbox, and tracking domain through the full QA pass.

Runs live in your browser via public DNS. Nothing is stored.

How to read the result

This checker looks for obvious blacklist risk on the sending domain and the mail servers published in its MX records. A listed result is a launch risk because receivers or filters may treat the domain, linked domain, or mail server as suspicious.

A clean current result is still only one checkpoint. A domain or IP can be unlisted today but still carry launch risk from recent blacklist history, abuse events, or contaminated shared infrastructure.

Current listings vs. blacklist history

Current blacklist status answers: “is this sender listed right now?” Historical blacklist intelligence answers: “has this sender recently been listed, repeatedly reported, or flagged by IP abuse sources?” OutboundQA keeps those signals separate so a live listing can block launch while historical issues can trigger review.

A real launch signoff should combine current blacklist status with SPF, DKIM, DMARC, MX readiness, tracking-domain SSL, domain age, sender history, and SMTP egress identity across every sending asset.

What this check does not catch

A passing domain and mail-server blacklist status lookup is useful, but it is not launch signoff. Cold email campaigns still fail when adjacent records, tracking domains, or inbox-level settings are broken.

SPF records

DKIM selectors

DMARC policy

tracking-domain SSL

domain age

inbox-level sending setup

Setup guides for this check

Read the setup notes behind this result, then verify the neighboring records before launch.

Email blacklists: check and delist

The RBLs that matter, how listings happen, how to check before launch, and the delisting process.

Domain warmup and safe sending volume

Why new domains are high risk, ramp schedules, per-inbox daily limits, and domain age.

Tracking domains: CNAME and SSL

Custom tracking domains, the CNAME to your sending tool, and why broken SSL kills click-through.

Need to check a full outbound workspace?

OutboundQA checks every domain, inbox, and tracking domain in the workspace, then gives you a shareable report with a Ready, Needs Fix, or Do Not Launch verdict.

Cold email launch checks to run next

Use this result as one checkpoint in the launch flow. Then verify the neighboring records and run the combined domain check before the outbound launch goes live.

SPF Checker

Look up a domain's SPF record and count its DNS lookups against the limit of 10.

DMARC Checker

Look up a domain's DMARC record and read its policy in plain English.

DKIM Checker

Look up a domain's DKIM selector and confirm the public key exists.

Auth Checker

Run SPF, DKIM, and DMARC together for a sending domain before launch.

MX Checker

Look up a domain's MX records and detect the mail provider.

Reputation Checker

Check observable cold email reputation risks across age, blacklist, authentication, MX, and HTTPS signals.

Deliverability Checker

Check observable cold email infrastructure readiness across MX, SPF, DKIM, DMARC, blacklist, age, tracking-domain, and SMTP egress identity signals.

Domain Checker

Run MX, SPF, and DMARC in one pass for a quick readiness verdict on a sending domain.

Sample Launch QA Report

See the report founders, teams, and agencies can share after the full QA pass.

Email Deliverability Tool

See how one-off checks turn into pre-launch QA for full cold email workspaces.

Questions

It checks the domain against domain-oriented blocklists and samples the domain's MX server IPs against IP DNSBLs. It is a current-status launch-risk screen, not a historical reputation report.

Some blocklists limit public DNS resolver traffic or fail transiently. Unknown means the lookup did not return reliable evidence. Treat it differently from clean and confirm before launch.

No. A clean current blacklist check is useful, but inbox placement also depends on authentication, domain age, historical sender reputation, list quality, copy, volume, and mailbox provider behavior.