SenderLock

DMARC on autopilot. From p=none to p=reject without breaking your email.

We find every service that sends as your domain, fix SPF and DKIM, step your policy up safely, and alert you to spoofing. Built for MSPs managing many client domains, and for small businesses that just want it done.

Why now

Inbox rules got strict

Gmail, Yahoo and Microsoft now require SPF, DKIM and DMARC for bulk senders. Mail without them gets filtered or rejected.

Most domains are exposed

Most domains still have no enforced DMARC policy, so anyone can send invoices and payment requests that look like they came from you.

Doing it by hand is slow

Reading XML reports and finding every sender takes weeks of engineer time. We automate it.

How it works

1. Check

Free grade for any domain with exact fixes.

2. Connect

Copy-paste records, or connect your DNS provider with your approval.

3. Discover

We read DMARC reports and identify every legitimate sender: Google, Microsoft 365, Mailchimp, HubSpot and more.

4. Enforce

We guide the step from none to quarantine to reject on a safe schedule, with alerts and one-click rollback. Nothing in DNS changes without your OK.

Simple pricing for small businesses

Planned launch pricing. Early-access members lock it in.

Starter
$19/mo
  • 1 domain
  • DMARC, SPF and DKIM monitoring
  • Weekly report in plain English
  • Spoofing alerts
Business
$49/mo
  • Up to 5 domains
  • Guided path to p=reject
  • Sender discovery
  • MTA-STS and TLS reports
Pro
$99/mo
  • Up to 20 domains
  • BIMI logo setup help
  • Lookalike-domain alerts
  • Priority support

For MSPs: $3 to $4 per client domain, no minimums

Partner pricing
$3-$4/domain/mo
  • Flat wholesale price, no monthly minimum commitment
  • White label on every tier
  • Multi-tenant dashboard for all clients
  • You set your own resale price
Reject in 30 days

Our goal for typical client domains is p=reject within 30 days. Guarantee terms will be published before launch.

Free pilot

Early-access MSPs get a free 60-day pilot for 3 client domains.

Join early access

Free to join, no payment, no commitment. We'll email you when early access opens.