![]() TLS doesn't encrypt the message, just the connection. However, if you forward a message that was sent through a TLS-encrypted connection, that message isn't necessarily encrypted. Once the connection is encrypted, all data sent through that connection is sent through the encrypted channel. Exchange Online uses TLS to encrypt the connections between Exchange servers and the connections between Exchange servers and other servers such as your on-premises Exchange servers or your recipients' mail servers. TLS supersedes Secure Sockets Layer (SSL) and is often referred to as SSL 3.1. Transport Layer Security (TLS), and SSL that came before TLS, are cryptographic protocols that secure communication over a network by using security certificates to encrypt a connection between computers. TLS basics for Microsoft 365 and Exchange Online Also provides information about the certificate issued by Microsoft for Exchange Online. Learn how Exchange Online and Microsoft 365 use Transport Layer Security (TLS) and Forward Secrecy (FS) to secure email communications. ![]() ![]() For more information about Microsoft Purview, see the blog announcement. Microsoft 365 compliance is now called Microsoft Purview and the solutions within the compliance area have been rebranded.
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