Comprehensive DMARC, SPF, and DKIM monitoring. Get real-time alerts, detailed analytics, and actionable insights to secure your email authentication.
No credit card required • 14-day free trial • Setup in 5 minutes
A complete toolkit to monitor, analyze, and improve your domain's email authentication.
Parse and visualize DMARC aggregate reports. Track authentication results and policy enforcement across all your sending sources.
Continuous SPF record monitoring with DNS lookup counting, include tracking, and syntax validation.
Automatic DKIM selector discovery and key validation. Monitor multiple selectors across all your email providers.
Real-time monitoring of critical DNS records. Get alerted immediately when records change unexpectedly.
Configurable alerts for authentication failures, policy violations, and DNS changes. Never miss a critical event.
Invite team members with role-based access. Share dashboards and collaborate on email security.
No signup required. Check your domain's email configuration instantly.
See what our customers say about protecting their domains with MailSentinel.
“MailSentinel helped us identify unauthorized senders within days of setup. Essential for any company serious about email security.”
“The cold email authentication guides saved us hours of troubleshooting. Our deliverability improved by 40% after implementing their recommendations.”
“Finally, a DMARC tool that's actually easy to understand. The visualizations make complex data accessible.”
Clear, technical walkthroughs for DMARC, SPF, DKIM, and deliverability—written for teams that ship email.
Learn why correlation doesn't equal causation in email delivery. Discover common mistakes email senders make when diagnosing deliverability issues and how to identify the real root causes.
Understand the difference between IP-based and domain-based blacklists, which ones actually impact B2B email deliverability, and how to monitor and manage your sender reputation effectively.
Quick reference guide for cold email authentication. Fast lookup for SPF, DKIM, and DMARC setup for Instantly, Smartlead, Email Bison, and other tools.
DMARC (Domain-based Message Authentication, Reporting & Conformance) is an email authentication protocol that protects your domain from being used in phishing and spoofing attacks. It builds on SPF and DKIM to give domain owners control over how receivers handle unauthenticated emails.
MailSentinel monitors your DMARC, SPF, and DKIM records continuously, parses aggregate reports, and alerts you to authentication failures. Our platform provides actionable insights to improve your email security posture.
Yes, MailSentinel offers a generous free tier that includes monitoring for up to 3 domains, basic DMARC report parsing, and essential alerts. Upgrade to Pro or Enterprise for advanced features.
Most users complete setup in under 5 minutes. Simply add your domain, update your DMARC record to point reports to MailSentinel, and start receiving insights within 24-48 hours.