Free tool

Recipient domain preflight checker

Paste a lead-list column and find domains to drop, quarantine, or review before the campaign depends on them.

This checks recipient-domain provider, gateway, and DNS readiness for a pasted recipient list. 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.

List quality has infrastructure signals too

Cold email preflight should not stop at the sender. A clean sending domain can still waste volume on personal inboxes, domains that cannot receive mail, or recipient domains protected by strict security gateways.

This checker gives operators a fast recipient-side screen before enrichment, mailbox validation, or launch signoff. It is built for pasted CSV columns and does not require mailbox access, API keys, or test sends.

How to use the result

Drop domains with no MX. Remove free inboxes when the campaign is supposed to target business addresses. Quarantine or review domains behind Proofpoint, Mimecast, Barracuda, Cisco, Forcepoint, or similar gateways before pushing volume.

A pass means the recipient domain has observable business-mail routing and basic public DNS evidence. It does not prove the exact mailbox exists or that your message will land in the primary inbox.

Sender QA and recipient QA are different gates

OutboundQA's launch report still focuses on the infrastructure you control: sending domains, inboxes, authentication, tracking domains, blacklist status, SMTP egress identity, and receiver requirements. Recipient-domain preflight is a fast list-screening layer that helps avoid sending to obvious infrastructure risk before the launch begins.

What this check does not catch

A passing recipient-domain provider, gateway, and DNS readiness 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.

individual mailbox validity

reply intent

role-account filtering

inbox placement

copy quality

sending-domain signoff

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.

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.

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.

Run a free workspace check View a sample report

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.

Receiver Checker

Check observable Gmail, Yahoo, and Microsoft sender requirements from public DNS and optional pasted message headers.

Tracking Checker

Check a branded cold email tracking domain for CNAME setup, DNS resolution, HTTPS, and redirect handoff.

MTA-STS Checker

Check MTA-STS and TLS-RPT records for inbound mail security posture before a cold email launch.

PTR/rDNS Checker

Check a custom SMTP egress IP for PTR, reverse DNS, and forward-confirmed rDNS before launch.

Launch Checklist

Generate a pre-launch QA checklist for domains, inboxes, authentication, tracking domains, blacklist checks, and signoff.

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 extracts unique domains from pasted emails or domains, checks MX records, detects the receiving provider, flags common security gateways, and notes whether SPF and DMARC records are visible.

Free inboxes are often outside a B2B ICP, and domains behind Proofpoint, Mimecast, Barracuda, or similar gateways may apply stricter filtering. Use those flags to drop, quarantine, or review rows before launch.

No. It checks recipient-domain infrastructure, not individual mailbox existence. Use it before mailbox validation or enrichment to remove domains that are obviously risky or unable to receive mail.

No. The checker runs in your browser using public DNS lookups. Pasted emails and domains are not sent to an OutboundQA backend.

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