Blog Post

Exchange Team Blog

6 MIN READ

Introducing PS.MTA-STS: a PowerShell module to enhance mail flow security with MTA-STS

Microsoft

Mar 04, 2024

TL;DR MTA-STS is a standard that allows domain owners to specify how mail servers should handle the encryption and authentication of their SMTP connections. MTA-STS can help prevent email spo...

Updated Mar 04, 2024

Version 1.0

Microsoft

Joined April 19, 2019

View Profile

Exchange Team Blog

You Had Me at EHLO.

Andres-Bohren

Steel Contributor

Oct 01, 2024

Hi SSzymkowiakIT

You can't check in advance.

You can enable MTA-STS and use TLS-RPT as described here

https://blog.icewolf.ch/archive/2024/04/12/mail-transfer-agent-strict-transport-security-mta-sts/

And also Monitor the Exchange Online Report "Inbound SMTP DANE with DNSSEC & MTA-STS Report"

https://admin.exchange.microsoft.com/#/reports/tlsrptdetails

By the way: I've implemented MTA-STS for a big Customer 40K Users for all Domains with no problems.

Kind Regards
Andres