#exchangeonline — Public Fediverse posts

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SMTP MTA Strict Transport Security (MTA-STS) is a relatively young protocol that allows you to signal the use of trusted certificates when encrypting electronic mail during SMTP transmission.

The transmission of electronic mail uses so-called opportunistic encryption. The client side connects to the server, notifies the server of its intention to encrypt the communication using STARTTLS and establishes an anonymous TLS connection, i.e. without authenticating the identity of the counterparty. If anything goes wrong at the beginning of the communication, the client switches to the backup plan and the mail is transmitted unencrypted.

The RFC even explicitly states that encryption must not be enforced for the sake of interoperability between servers. That is the reason why we have MTA-STS that is somewhat similar to HSTS in the HTTPS world. And Exchange Online in Office 365 supports MTA-STS for incoming and also outgoing emails. It just needs to be configured.

Learn how to configure MTA-STS for Office 365 from my today's blog post https://www.cswrld.com/2024/04/how-to-enable-mta-sts-in-office-365/

#mtasts #smtp #email #office365 #exchangeonline #cybersecurity #tips