Free tool

Cold email domain checker

Enter a sending domain to run MX, SPF, and DMARC at once and get a quick readiness read before you launch.

This checks MX, SPF, and DMARC 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.

A quick three-check read

This is the mini version of the OutboundQA launch check. It confirms the domain can receive mail (MX), has exactly one valid SPF record, and has a DMARC policy in place. If any of the three is missing, you have a problem to fix before launch.

For a real outbound launch you want the full pass: DKIM, tracking domain SSL, blacklist status, domain age, and the sender checklist, across every domain and inbox, with a verdict and a report. That is what launch QA gives you.

What this check does not catch

A passing MX, SPF, and DMARC 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.

DKIM selectors

tracking-domain SSL

blacklist status

domain age

inbox-level setup

Google and Yahoo sender requirements

Setup guides for this check

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

SPF for cold email

The exactly-one-record rule, the 10 DNS lookup limit, and the SPF mistakes that block a launch.

DMARC for cold email

Policies, alignment, rua reports, and the Gmail and Yahoo requirement that made DMARC mandatory.

MX records and mail routing

How MX records route replies and bounces, provider records for Google and Microsoft, and common mistakes.

Domain warmup and safe sending volume

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

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.

Blacklist Checker

Check a domain and sampled mail server IPs against domain and email blocklists.

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.

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 runs three live DNS checks in one pass: MX (can the domain receive mail), SPF (is there one valid record), and DMARC (is a policy in place). It returns a quick Ready, Needs Fix, or Do Not Launch style read.

No. This is the quick three-record version. The full launch QA covers 20+ checks including DKIM, tracking domain SSL, blacklist status, domain age, SMTP egress identity, and the Google and Yahoo sender checklist, across every configured asset.

No. The lookups run in your browser against public DNS. Nothing is saved.