B5 Secure b5secure.com
Email transport security

MTA-STS policy service

This service publishes the official Mail Transfer Agent Strict Transport Security policy for b5secure.com.

Policy status Testing Monitoring before enforcement
Authorized mail platform Microsoft Exchange Online TLS-protected inbound delivery
Policy version STSv1 RFC 8461
View machine-readable policy

Never Trust™. Verify Everything.™

Transport protection with explicit evidence.

MTA-STS helps supporting senders require authenticated TLS and validate the expected Exchange Online destination before delivering email to B5 Secure.