Enforce TLS Encryption for All Email
Implement MTA-STS to enforce TLS encryption for inbound email and TLS-RPT for monitoring. Includes free MTA-STS policy file hosting on our infrastructure.
MTA-STS Status
acme-corp.com
SMTP Mail Transfer Agent Strict Transport Security
MTA-STS is an email security standard that enables domain owners to declare their mail servers support TLS encryption and instructs sending servers to refuse delivery if a secure connection cannot be established. It prevents man-in-the-middle attacks and encryption downgrade attacks.
Without MTA-STS
- Email can be intercepted in transit
- Attackers can force unencrypted delivery
- No visibility into TLS failures
- Man-in-the-middle attacks possible
- Compliance requirements not met
With MTA-STS
- All email encrypted with TLS 1.2+
- Downgrade attacks prevented
- Real-time TLS failure reports
- MITM attacks blocked
- Meet HIPAA, PCI, SOC2 requirements
MTA-STS Policy Modes
Progress safely from monitoring to enforcement
mode: noneDiscovery
No MTA-STS policy - email delivered without TLS enforcement
mode: testingTesting Mode
Collect TLS reports without enforcing encryption requirements
mode: enforceEnforce Mode
Reject email from servers that cannot establish TLS
MTA-STS Implementation Services
End-to-end TLS enforcement with free policy hosting
MTA-STS Policy
Define and publish your email encryption requirements
- Policy file generation
- DNS record setup
- Mode configuration
- Version management
Free File Hosting
Host your MTA-STS policy file on our global infrastructure
- HTTPS delivery
- Global CDN
- 99.9% uptime SLA
- No bandwidth limits
TLS-RPT Monitoring
Receive and analyze TLS failure reports from sending servers
- Report aggregation
- Failure analysis
- Trend visualization
- Root cause identification
Certificate Management
Ensure valid TLS certificates for policy compliance
- Certificate validation
- Expiry monitoring
- Renewal alerts
- Chain verification
Policy Progression
Safely transition from testing to enforcement mode
- Testing mode
- Enforce mode
- Gradual rollout
- Rollback support
Failure Alerting
Real-time notifications when TLS connections fail
- Email alerts
- Slack integration
- PagerDuty support
- Custom thresholds
Visibility into TLS Connection Failures
TLS-RPT is a companion standard to MTA-STS that provides feedback when sending servers encounter TLS issues. Get detailed reports about certificate problems, policy failures, and connection errors.
- Daily aggregate reports from sending servers
- Certificate validation failures
- Policy fetch errors
- Connection negotiation issues
Implementation Timeline
From audit to enforcement in weeks, not months
Audit
Assess current TLS configuration and certificate status
- TLS version check
- Certificate validation
- Mail server inventory
Configure
Create MTA-STS policy and TLS-RPT DNS records
- Policy file creation
- DNS record setup
- CDN hosting
Test
Run in testing mode and monitor TLS reports
- Report collection
- Failure analysis
- Issue remediation
Enforce
Switch to enforce mode after successful testing
- Policy update
- Verification testing
- Documentation
Monitor
Continuous monitoring and certificate management
- Report analysis
- Alert management
- Certificate renewals
Technology Partners
Industry-leading tools for MTA-STS implementation
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Ready to Enforce Email Encryption?
Implement MTA-STS with free policy hosting. Protect your email with mandatory TLS encryption.