How can I check DMARC?

Enter your domain above. The checker looks up the TXT record at _dmarc.yourdomain, tells you if it's there, and shows the policy it sets: none, quarantine, or reject.

What is DMARC used for?

DMARC tells receiving mail servers what to do when a message fails SPF or DKIM. With p=quarantine or p=reject, spoofed mail from your domain goes to spam or gets refused. With p=none, it's only monitored.

How can I fix my DMARC issues?

If there's no record, publish a TXT record at _dmarc.yourdomain with v=DMARC1; p=none; rua=mailto: and a reports address. Read the reports for 2 to 4 weeks, confirm no real mail is failing, then move to p=quarantine and later p=reject.

What does the checker test?

SPF, DKIM, and DMARC, the three records Gmail and Yahoo expect from bulk senders. It doesn't test blacklists, MX records, or inbox placement. Once the domain passes, write the outreach with the AI sales email generator.

Why does it say DKIM wasn't found?

DKIM has no way to look up every selector, so the check tries 8 common ones. If your provider uses a custom selector, find it on your provider's DKIM setup page. A warning here can mean it's set up under a name the check can't guess.

How is this different from other checkers?

Most checkers hand you a static score and stop there. This one grades the records, then hands the domain to agents that send through warmed inboxes with ramp caps and reply detection. Deliverability becomes part of the play, not a report you file.

What happens after I sign up for Intempt?

Intempt sends every journey through warmed inboxes and ramp caps, suppresses against your customer list, and tracks inbox placement over time. You keep the strategy layer: which lists, which cadence, which threshold counts as a problem. The agent runs the play inside those guardrails.

All free tools

A brass compass lying open on a sea chart beside a starfish.

Marketing

Free email deliverability test.

Test your domain's email deliverability with live SPF, DKIM, and DMARC lookups, spam-risk flags, and the exact records to fix. In Blu, deliverability is a standing check: warm-up caps, complaint handling, and unengaged contacts suppressed before they burn the domain.

How to use the email deliverability test

It takes three steps and every output renders on this page so you can copy or export it right away.

Enter your sending domain

Type the domain your email goes out from. That's the only input, and the check reads your public DNS records.

Run the check

The email deliverability test looks up SPF, DKIM, and DMARC live and grades the domain pass, at risk, or fail. Every failing check comes with the record to add.

Open it inside Intempt

This page grades the domain once. In Blu, deliverability runs as a standing play: warm-up and ramp caps on the domain, suppression against your customer list, and a handoff to you the moment a record drifts.

Use in Claude

Blu Agent

Who it's for

Anyone troubleshooting why email is landing in spam
Teams verifying email authentication after a provider migration or DNS change

What's in the download

SKILL.md - The SPF/DKIM/DMARC check logic and fix templates, plus instructions to run the same live public DNS TXT lookups directly (dig/nslookup or a public DNS-over-HTTPS API) - no MCP or email-platform account needed, since these are public DNS records.

How to install it

claude.ai or Claude Desktop

Upload as a zip in Capabilities

Paid plan

Open Settings, then Capabilities
Turn on code execution if it isn't already on
Upload the .zip you downloaded

Requires a Pro, Max, Team, or Enterprise plan. Not available on the Free plan.

Claude Code

Drop the folder, it auto-loads

Any plan

Unzip the download
Drop the folder into ~/.claude/skills/ (or .claude/skills/ in a project)
Claude Code finds it automatically

$ ls ~/.claude/skills/
your-new-skill/

What you need

Claude Desktop or claude.ai (Pro, Max, Team, or Enterprise for claude.ai upload)
Claude Code: no plan restriction

Try it with

“Check acme.co's SPF, DKIM, and DMARC using the email-deliverability-checker skill”
“Why might mail from this domain be landing in spam? Check its authentication records.”

Prefer an instant answer? Run it now above.

What you get from the email deliverability test

What it does on this page, and what it does inside Intempt.

An SPF DKIM DMARC checker that reads your live DNS

Enter one domain, with no mailbox access or email provider connection
SPF passes only when there's exactly one valid record at the root domain
DKIM is checked at 8 common selectors, like google, selector1, and s1

A deliverability check input card for a sample domain, set to read live public DNS and common DKIM selectors.

What the DMARC checker tells you to fix

Shows your DMARC policy and warns when it's p=none, which only monitors
Each failing check comes with the record format to publish
No DMARC record? It suggests p=none first, then quarantine, then reject

A live DNS check for a sample domain showing SPF and DKIM passing and a DMARC warning for a p=none policy.

Warm-up and ramp caps are guardrails, not settings you remember

The agent configures warm-up and ramp caps as part of setting up the send
Daily ramp caps apply the moment a domain is new
The guardrails are set up before the first real email goes out

SPF, DKIM, and DMARC configured on the sending domain from day one.

Suppress against your own customer list on every send

Paying customers never end up on the send list
Do-not-contact and unsubscribed contacts are excluded the same way
You write the suppression rule, the agent applies it every time

Suppression rules applied automatically before a send goes out.

See it work on your own output.

Start free

Questions about theemail deliverability test.

01 / 08

Is the email deliverability test free?

Yes. Sign up for the free Intempt plan, then run domain checks on this page free 10 times a day, and up to 10 times a day across all the tools. Warm-up, ramp caps, reply detection, and deliverability tracking over time sit inside the Intempt free plan: a free plan, no trial timer.

Teams love it

They stopped stitching tools andhired one system.

Acquisition and retention are one connected motion. Personalizing the path before signup only pays off when the same system carries the user through onboarding afterward.

Anonymous traffic was not turning into registered users, and acquisition and retention were run as two separate problems. We ran Experiences on the anonymous visitor flow to put the right content and CTAs in front of each visitor, then handed new signups to automated Journeys for onboarding and deeper engagement.

455,396

users instrumented

Read the full research

Judge experiments on revenue per visitor instead of conversion rate. A variant can win on conversions and still lose on revenue, and repeat buying only shows up when the whole journey is in one view.

High-intent shoppers browsed a large, specialized outdoor catalog, and browsing, product interest and purchase history sat in different places. We unified them into one customer view, then ran real-time personalization, intent-based segmentation and timely follow-ups on top of it, judging experiments on revenue per visitor.

Read the full research

Build the pipeline on observed signals. When follow-ups trigger on intent, the team spends its time on the users who are genuinely engaging.

Static lead lists and timeline-based follow-ups were hiding who was actually engaging. We ran a signal-led outbound pipeline where follow-ups fire on real behavior: outbound replies, onboarding progress and product usage.

Read the full research

Warm the domain, then watch it.

Warmed inboxes, ramp caps as guardrails, reply-detection handoff, and drift alerts on the domain you send from.

Start for free

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