MTA-STS generator
Enforce TLS encryption for your email traffic
How Skysnag Simplifies MTA-STS
Skysnag automates the implementation and management of MTA-STS for your domain, ensuring your emails are always transmitted securely.
Automated Setup
Generate and deploy MTA-STS policies with zero manual configuration
DNS Record Management
Create and maintain the required DNS records for MTA-STS
Policy Hosting
Host your MTA-STS policy file on secure, high-availability servers
TLS-RPT Integration
Seamlessly integrate with TLS-RPT for comprehensive reporting
Gradual Deployment
Safely progress from testing to enforcement mode without disrupting email
Continuous Monitoring
Monitor your MTA-STS policy effectiveness and detect issues
What is MTA-STS?
MTA-STS (Mail Transfer Agent Strict Transport Security) is an email security standard that enables domain owners to enforce TLS encryption for all incoming emails. It prevents attackers from intercepting email through downgrade attacks or man-in-the-middle techniques.
Enforce TLS Encryption
Require that all mail servers connecting to your domain use TLS encryption, preventing plaintext email transmission.
Prevent Downgrade Attacks
Stop attackers from forcing email delivery over unencrypted connections where they could intercept messages.
Certificate Validation
Verify the validity of TLS certificates presented by mail servers to prevent man-in-the-middle attacks.
Failure Handling
Define how mail servers should handle delivery failures when TLS requirements cannot be met.
MTA-STS Policy Modes
MTA-STS policies can be deployed in different modes depending on your security requirements:
Start here for visibility
Testing Mode
Monitor mode - report failures but deliver messages anyway
Maximum protection
Enforce Mode
Strict mode - reject delivery if TLS requirements aren't met
For policy removal only
None Mode
No policy enforcement - used to remove an existing policy
MTA-STS Implementation Results
See the impact of implementing MTA-STS with Skysnag
100%
TLS-encrypted email delivery
98%
reduction in downgrade attacks
24/7
policy monitoring and alerts
99.9%
secure email delivery rate
