Free tool

Free MX record checker

Use this MX record checker to confirm a domain can receive replies and see which mail provider handles it, such as Google Workspace or Microsoft 365.

This checks MX record 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

The checker lists the MX hosts and detects the provider from common host patterns. If there is no MX record, the domain cannot receive mail, which becomes visible the moment a prospect replies or your team tests the inbox.

MX is one of the first checks in a cold email launch QA pass. OutboundQA verifies it across every inbox in the workspace alongside SPF, DKIM, DMARC, tracking SSL, and blacklist checks before a campaign goes live.

What this check does not catch

A passing MX record 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

blacklist status

Google and Yahoo sender requirements

Setup guides for this check

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

MX records and mail routing

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

Google and Yahoo bulk sender requirements

SPF, DKIM, DMARC, one-click unsubscribe, and the spam-rate thresholds bulk senders must meet.

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.

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.

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

MX (Mail Exchange) records tell other servers where to deliver mail for your domain. No MX record means the domain cannot receive mail, which is a launch blocker for any inbox you expect replies on.

Cold email deliverability depends partly on the sending provider. Google Workspace and Microsoft 365 mailboxes generally land better than custom SMTP, so knowing the provider helps you set expectations before launch.

This tool checks MX (receiving) and detects the provider. A full launch check also covers SPF, DKIM, DMARC, tracking SSL, blacklist, and domain age. That is what OutboundQA runs.