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Free email health check and DMARC monitoring

Email health check: test, fix and monitor your domain's email.

Get a free grade across SPF, DKIM, DMARC and MX in about ten seconds. See what to fix first, then let us watch for changes every day.

1 domain free foreverResults in secondsNo signup for the check

What an email health check tests

An email health check reads the public DNS records that decide whether mail from your domain is trusted. Ours grades MX, SPF, DKIM and DMARC in one pass, ranks what to fix first and gives you the record to publish. Monitoring then re-checks them daily, adds BIMI, MTA-STS, DNSSEC and TLS reporting, and reads your DMARC reports.

MX records

Your domain publishes working MX records, so other servers know where to deliver its mail.

SPF

One valid SPF record, the senders it authorizes, and whether it stays under the 10 DNS-lookup limit.

DKIM

A published signing key on common selectors. Not finding one is a warning, not proof DKIM is missing.

DMARC

Your policy (none, quarantine or reject), the reporting address and how close you are to enforcement.

Blacklists

A separate free check of your mail servers against 5 major spam blacklists.

Bounce codes

Paste a bounce to decode the SMTP code, see whether it is hard or soft and whether to retry.

Healthy email in 3 steps:

1

Check your domain

One grade across MX, SPF, DKIM and DMARC, with every finding in plain English.

2

Fix what matters first

Findings are ranked by risk, each with a copy-ready record for your DNS host.

3

Stay monitored

We re-check every day, read your DMARC reports and alert you when something breaks.

SPF · DKIM · DMARC · MX · BIMI · MTA-STSGoogle, Yahoo and Microsoft sender rulesFree to get started

More than a checker. A checkup that keeps running.

Email breaks quietly. A DNS edit, an expired key or a new tool someone connected. We watch the signals behind delivery so you hear about it first.

DMARC reports, decoded

Every service that sends as you, named and scored. Mailbox providers send XML reports about your domain. We turn them into a list of senders you can act on.

Safe path to p=reject

Know when it is safe to tighten DMARC. We simulate the stricter policy against your last 30 days of real traffic before you publish it.

Full change history

See what changed, when, and why your grade moved. Every record edit is logged, so a change someone else made shows up as a dated entry.

Works inside ClaudeNew

Ask about your domains in plain words. Connect the HealthCheck Email MCP server and let Claude or your own agents read grades, senders and alerts.

Sender rules, checked

Meet Google, Yahoo and Microsoft bulk-sender rules. A live pass or fail for each provider, with the fix next to every miss.

Alerts where you work

Hear about it the same day, not from a customer. Route record changes, grade drops and spoofing spikes to email, Slack or a webhook.

Inside HealthCheck Email.

See how a domain goes from a first grade to full enforcement, without reading a single RFC.

northwind.studioMonitoring
B77 / 100
SPFPass
DKIMPass
DMARCReview
MXPass
MTA-STSNot set
Next step: your DMARC policy is p=none. It collects reports but does not stop spoofing. Review senders, then move to quarantine.

Free checks. Clear answers.

No account, no card and no email wall on the basic result. Run any check in about ten seconds.

Email health check

One grade across MX, SPF, DKIM and DMARC, with fixes in priority order.

DMARC checker

See whether someone else can send email pretending to be you.

SPF checker

Trace every authorized sender and the 10-lookup limit.

DKIM checker

Find your signing keys and check they are set up right.

MX lookup

Confirm where your domain receives mail.

Bounce analyzer

Decode a bounce, learn whether to retry and what to check next.

See all free tools

From the guides

Browse all guides
AuthenticationA record passes. A message fails. What now?DNS and routingMake sense of the records behind delivery.OperationsBuild a routine that catches the next issue.

Why a checkup beats a one-off scan.

A free scan tells you how things look right now. Email breaks later. Here is what changes when someone keeps watching.

What you get
One grade for all records
Re-checks every day
Reads DMARC reports
Tells you when p=reject is safe
DNS change history
Alerts on changes
Works in Claude
HealthCheck EmailMonitoring
Yes, A to F
Daily
In plain English
Simulated on 30 days
Every edit logged
Email, Slack, webhook
MCP server
Start freeYour first grade in about 10 seconds
One-off checkerSingle lookup
Separate tools
When you remember
No
No
No
No
No

“One-off checker” means a free DNS lookup that returns a single snapshot. Some HealthCheck Email features need a paid plan.

Start free. Upgrade when you outgrow it.

Every plan includes the daily checkup, DMARC analytics and a public health page. Pro and Agency start with a 7-day free trial.

Free
$0

Free forever

For your own domain

  • 1 domain monitored
  • Daily checkup, grading & essential fixes
  • DMARC Analytics & 30-day history
  • 1 email alert destination
  • Bulk import & public health page
Start free
Basic
$7/mo

$7 billed monthly

Essential monitoring for a couple of domains

  • 2 domains monitored
  • Enforcement guidance & infrastructure monitoring
  • Infrastructure monitoring & 90-day history
  • 3 email alerts per domain
  • Bulk import & public health pages
Get Basic
ProMost popular
$19/mo

$19 billed monthly

For a growing business

  • 20 domains monitored
  • DMARC Analytics, infrastructure & 1-year history
  • Enforcement readiness & reputation monitoring
  • Campaign testing, Slack & webhook alerts
  • API & MCP access, unlimited API keys
  • Unlimited team members
Start 7-day trial
Agency
$79/mo

$79 billed monthly

For agencies & freelancers with clients

  • 120 domains monitored
  • Client workspaces & read-only client logins
  • Unlimited team members & 2-year history
  • Everything in Pro
Start 7-day trial

The fine print, in plain English

  • Unlimited on every plan: free health checks, bulk-import attempts, and public health-page views.
  • Limited by plan: monitored domains, history, team seats, API keys, and alert destinations according to your plan. If you reach a limit, paid integrations and automation pause after a downgrade, but we keep their configuration and history so they resume when you upgrade again.
  • Our promise: the limits your plan has today will never be reduced.

FAQ

Some frequently asked questions.

What does an email health check test?

Our free email health check reads your domain's public DNS and grades four records in one pass: MX (where mail is delivered), SPF (which servers may send for you, and the 10-lookup limit), DKIM (a published signing key on common selectors) and DMARC (policy and reporting). Separate free tools check 5 spam blacklists and decode bounce codes.

Is the free plan really free?

Yes. One domain, daily grading, essential fixes, DMARC analytics, 30-day history, one email alert and a public health page, forever and with no card.

Can I check my domain without signing up?

Yes. The free checkers, record generators, header analyzer and bounce analyzer work without an account. Create a free account when you want to monitor a domain over time.

Do I need to be technical to use this?

No. Every result is explained in plain English: what is wrong, why it matters and the exact record to publish, with a copy button. The raw detail is there if you want it.

What does monitoring do every day?

We re-check SPF, DKIM, DMARC, MX, BIMI, MTA-STS, DNSSEC and TLS reporting, recompute your grade, log DNS changes and process the reports mailbox providers send about your domain.

Does HealthCheck Email change my DNS?

You stay in control of your DNS. Use the findings and copy-ready records to make changes at your DNS provider, then verify the results. Your sending provider supplies account-specific keys and settings.

I manage domains for clients. Is this for me?

Yes. Agency covers 120 domains with unlimited team members. Bulk-add domains, invite teammates, keep separate history per domain and share public health pages.

Can you guarantee inbox placement?

No tool can. Mailbox providers also weigh reputation, content and engagement. HealthCheck Email helps you find and fix the measurable problems; the receiving provider makes the placement decision.

Can I use it from Claude?

Yes. Connect the HealthCheck Email MCP server from your dashboard, then ask Claude about your domains, senders, enforcement readiness and alerts.

Your next send, without the guesswork.

Get your free grade now and monitor your first domain in under two minutes.