1. MTA-STS Policy Creation and Configuration

Create a comprehensive MTA-STS policy file that defines your transport security requirements:

2. Cloudflare Hosting Configuration

Host your MTA-STS policy on Cloudflare's global network for maximum reliability and performance:

3. MTA-STS DNS Bootstrap Record

Publish the MTA-STS DNS TXT record to enable policy discovery:

4. TLSRPT (TLS Reporting) Configuration

Implement TLS Reporting to receive feedback on TLS connection successes and failures:

Multi-Subdomain Architecture

Enterprise environments with multiple subdomains require coordinated MTA-STS implementation:

Certificate Management and Validation

Proper certificate management is critical for MTA-STS enforcement:

Phased Implementation Approach

Adopt a structured deployment approach to minimize disruption:

Policy Fetch Failures

Symptoms: TLSRPT reports indicating policy fetch failures or timeouts

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20 min read

Updated 2025-10-22

Tutorials

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