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 Enforced Strict TLS enforcement active
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.