Know who's sending email as your domain
dmarco collects and analyzes DMARC aggregate reports so you can identify unauthorized senders, validate your SPF and DKIM configuration, and strengthen your email authentication — before attackers exploit it.
What is DMARC monitoring?
Every day, email providers like Google, Microsoft, and Yahoo send DMARC aggregate reports to domain owners. These XML reports reveal who is sending email as your domain and whether those messages pass authentication checks. Most organizations never read them.
Collect
Connect your DMARC inbox and dmarco automatically fetches, parses, and stores aggregate reports from every reporting organization.
Analyze
See exactly which servers are sending email as your domain, whether they pass SPF and DKIM, and which senders are authorized vs unknown.
Protect
Get actionable recommendations to move from monitoring (p=none) to enforcement (p=reject), with confidence that legitimate senders won't be blocked.
Everything you need for DMARC compliance
Sender Attribution
Automatically identify senders by IP, reverse DNS, ASN, and CIDR range. Match against known providers like Google Workspace, Microsoft 365, Mailgun, SendGrid, and more.
SPF & DKIM Validation
Live DNS diagnostics for your DMARC and SPF records. See which senders are SPF-authorized, track SPF changes over time, and get alerts when configuration drifts.
Per-Domain Sender Review
Approve or flag senders on a per-domain basis. Know which providers are expected for each domain and get alerted when unknown senders appear.
Policy Progression Guidance
Data-driven recommendations for when to move from p=none to p=quarantine to p=reject, based on your actual pass rates and sender coverage.
Alerting & Webhooks
Get notified of unknown senders, SPF/DKIM failure spikes, and volume anomalies. Deliver alerts via webhooks to Slack, PagerDuty, or any HTTP endpoint.
Multi-Domain, Multi-Tenant
Monitor dozens of domains across multiple organizations. Each org gets isolated data, configurable settings, and its own sender review workflow.
Simple pricing, start free
Monitor your first domain at no cost. Upgrade when you need more.
Starter
1 domain, 1 inbox, 7-day retention
Growth
25 domains, 5 inboxes, 180-day retention
Enterprise
100 domains, dedicated DB, SLA
Sovereign
Self-hosted, full data sovereignty