Does Messaging Gateway support MTA-STS?

Products

• Messaging Gateway

Issue/Introduction

Mail Transfer Agent Strict Transport Security (MTA-STS) is an email standard that allows email senders to enforce TLS secured delivery of email traffic.

Historically, TLS secured email has been an option that may be offered by the receiving server via the STARTTLS SMTP verb but MTA-STS allows senders to require TLS delivery and that the destination mail server authenticate itself via TLS certificate.

Resolution

Currently, Messaging Gateway does not support MTA-STS but MTA-STS may be implemented as a feature in future versions of the product.

Messaging Gateway can specify that TLS delivery is required via the Delivery tab of the Protocols > Domains entry for a domain but this is set on a per domain option.

Similarly, SMG can require TLS security be used when recieving messages for a domain: