Introduction to MailSentinel

Welcome to MailSentinel - your comprehensive DMARC, SPF, and DKIM monitoring platform.

Welcome to MailSentinel

MailSentinel is a comprehensive email authentication monitoring platform that helps you protect your domain from email spoofing and phishing attacks.

What is MailSentinel?

MailSentinel provides real-time monitoring and analysis of your domain's email authentication records:

  • DMARC Monitoring - Parse and visualize DMARC aggregate reports
  • SPF Validation - Continuous SPF record monitoring and validation
  • DKIM Verification - Automatic DKIM selector discovery and validation
  • DNS Monitoring - Real-time alerts for DNS record changes
  • Smart Alerts - Configurable notifications for authentication failures

Why Email Authentication Matters

Email spoofing is one of the most common attack vectors used by cybercriminals. Without proper authentication:

  • Attackers can send emails pretending to be your domain
  • Your brand reputation suffers from phishing attacks
  • Email deliverability decreases as providers distrust your domain
  • You lack visibility into who is sending email on your behalf

Key Features

Real-Time Monitoring

MailSentinel continuously monitors your DNS records and processes DMARC reports as they arrive, giving you up-to-the-minute visibility into your email authentication status.

Actionable Insights

We don't just show you data - we help you understand what it means and what to do about it. Our platform provides:

  • Clear pass/fail status for all authentication checks
  • Detailed breakdowns of sending sources
  • Step-by-step remediation guidance
  • Progress tracking toward enforcement

Team Collaboration

Invite team members with role-based access control. Share dashboards, collaborate on issues, and keep everyone informed about your email security posture.

Why Email Authentication Is Required

Google & Yahoo Requirements (2024)

Starting February 2024, Google and Yahoo require:

  • Bulk senders (5,000+ emails/day): SPF, DKIM, and DMARC all required
  • All senders: SPF or DKIM authentication required
  • DMARC alignment: From: domain must align with authenticated domain
  • One-click unsubscribe: Required for marketing emails
  • Spam rate: Must stay below 0.3%

Microsoft Outlook Requirements (2025)

Starting May 2025, Microsoft enforces similar requirements:

  • Bulk senders: SPF, DKIM, and DMARC all required
  • DMARC must pass: Alignment required for deliverability
  • One-click unsubscribe: Required for marketing emails
  • Spam rate: Must stay below 0.3%

Learn more: Microsoft Outlook Requirements Guide

Getting Started

Ready to protect your domain? Here's how to get started:

Quick Start (5 Minutes)

  1. Create an Account - Sign up for a free 14-day trial
  2. Add Your Domain - Verify ownership and start monitoring
  3. Configure DMARC - Set up your DMARC policy
  4. Monitor Reports - Analyze your email authentication data

Documentation Sections

📚 Core Concepts

Learn the fundamentals of email authentication:

🌐 DNS Providers

Step-by-step guides for your DNS provider:

☁️ Email Service Providers

Configure authentication for your email services:

📤 Cold Email

Optimize deliverability for cold outreach:

🔧 Troubleshooting

Fix common email delivery issues:

⚡ Features & Tools

🔌 API Reference

Need Help?