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What is MailShield?
MailShield is an email security monitoring platform that helps organizations monitor, verify, and improve the security posture of their email infrastructure.
The Problem
Email remains one of the most exploited attack vectors in cybersecurity. Common threats include:
- Email Spoofing: Attackers forge sender addresses to impersonate your organization
- Phishing Attacks: Fraudulent emails trick recipients into revealing sensitive information
- Business Email Compromise (BEC): Sophisticated attacks targeting employees with fake executive emails
- Domain Impersonation: Lookalike domains used to deceive your customers and partners
Modern email security relies on a set of DNS-based authentication protocols (SPF, DKIM, DMARC) that, when properly configured, significantly reduce these threats.
The Solution
MailShield provides comprehensive monitoring and analysis of your email security configuration:
DNS Security Checks
MailShield checks your domain's DNS records and mail servers every 2 hours:
| Protocol | Purpose |
|---|---|
| SPF | Specifies which mail servers can send email for your domain |
| DKIM | Adds digital signatures to emails to prevent tampering |
| DMARC | Unifies SPF and DKIM with policies and reporting |
| MX | Your mail servers, their TLS support and certificates |
| MTA-STS | Makes senders require TLS when delivering to you |
| TLS-RPT | Reports TLS connection failures |
| BIMI | Displays your brand logo in email clients |
| DNSSEC | Adds cryptographic signatures to DNS |
| DANE | Pins your mail servers' certificates in DNS |
Report Processing
MailShield automatically receives and processes:
- DMARC Aggregate Reports (RUA): Daily summaries from email providers showing authentication results
- TLS-RPT Reports: Statistics on TLS connection attempts and failures
Security Scoring
Every verified domain receives a security score from 0-100 (grades A-F) based on:
- Which records are in place for the way the domain is used
- Policy strength (e.g., DMARC enforcement level)
- Key strength and certificate health
- Whether reports reach MailShield
Alerting
Get notified when:
- Your security score changes significantly
- DNS records change, or a mail server develops a problem
- Authentication failure rates spike
- A mail server certificate or BIMI certificate is about to expire
Who Uses MailShield?
MailShield is designed for:
- IT Administrators managing email infrastructure
- Security Teams monitoring organizational security posture
- MSPs managing email security for multiple clients
- Compliance Officers ensuring email security requirements are met
Next Steps
- Get Started with MailShield
- Learn about Email Security fundamentals
- Explore Features in detail