DdoorcheckGet early access
Email infrastructure, checked

Ship email your
customers can trust.

Doorcheck watches every layer of your sending setup—from DNS and TLS to reputation and inbox placement—so problems get fixed before your customers notice.

Start checking free ↗See how it works ↓
SPFDKIMDMARCMTA-STSTLS-RPT
Your domain, at a glance SPF Aligned DKIM Signing DMARC Enforced TLS Valid
01 / Why Doorcheck

Email breaks quietly.
We make it obvious.

A DNS edit, an expired certificate, or a reputation dip can derail critical messages without a visible error. Doorcheck turns the invisible infrastructure behind email into one calm, actionable view.

01

Catch drift early

Continuous checks notice authentication, DNS, and transport changes before they become delivery failures.

02

Know what to fix

Every alert includes plain-language impact, evidence, and a prioritized remediation path.

03

Prove your posture

Share a current record of domain protection, TLS health, and policy enforcement with your team.

02 / One source of truth

Every signal.
One clean answer.

Doorcheck correlates the standards, reports, certificates, and reputation signals that usually live in separate tools.

  • ✓ Domain authentication and alignment
  • ✓ Certificate and transport security
  • ✓ DMARC and TLS report analysis
  • ✓ Reputation and blocklist monitoring
  • ✓ Inbox placement spot checks
doorcheck.ioLast checked 42 sec ago
Domain health98/100
Excellent
SPFAligned
DKIMSigning
DMARCEnforced
TLSValid
Reputation98 / 100
7d activity
03 / How it works

From unknown to
under control.

No agents. No migration. No risky DNS changes to get started.

  1. 1

    Add your domain

    Enter a domain. Doorcheck safely discovers its public sending and security configuration.

  2. 2

    Review the check

    See what passes, what needs attention, and exactly why it matters to delivery.

  3. 3

    Stay ahead

    Get notified when the posture changes, with evidence your team can act on immediately.

✓
04 / Security by default

Observe the system.
Not the message.

Doorcheck is built to assess mail infrastructure without reading mailbox content. Access is minimized, transport is encrypted, and monitoring data is isolated by account.

Read our privacy policy ↗
05 / Early access

Start with every
signal switched on.

Doorcheck is free during early access. Help shape the product while protecting your sending domains from day one.

Early access
$0while in beta
  • Up to 5 sending domains
  • Continuous standards monitoring
  • Prioritized remediation guidance
  • Email alerts and weekly digest
  • Direct line to the product team
Join early access ↗No credit card. Leave whenever you like.
06 / Questions

The useful
answers.

01Is Doorcheck an email service provider?+

No. Doorcheck sits beside your existing provider and continuously checks the technical signals that determine whether mail is trusted and delivered.

02Will you need access to our inboxes?+

No. Monitoring is designed around public DNS, transport signals, aggregate reports, and optional synthetic tests. Doorcheck does not need to read customer message content.

03Which providers do you support?+

Any standards-compliant sending setup. That includes Google Workspace, Microsoft 365, Postmark, SendGrid, Mailgun, Amazon SES, self-hosted infrastructure, and mixed-provider environments.

04How quickly can we get started?+

Add a domain and Doorcheck can produce the first health check in minutes. Optional DMARC reporting and inbox tests become richer as data arrives.

Your next check takes two minutes

Make email boring.
In the best way.

Start checking free ↗