For more information about managing certificates in hybrid deployments, see Certificate requirements for hybrid deployments. You must also securely store and maintain these server certificates. As a result, you need to manage your own security certificates for your on-premises Exchange servers. If you're managing a hybrid Exchange deployment, your on-premises Exchange server needs to authenticate to Microsoft 365 using a security certificate to send mail to recipients whose mailboxes are only in Office 365. TLS and hybrid Exchange Server deployments For information on using connectors to configure mail flow, see Configure mail flow using connectors in Office 365. Exchange Online uses connectors to protect messages that you send from unauthorized access before they arrive at the recipient's email provider. Your partner needs to manage their own certificates. Forced TLS requires your partner organization to authenticate to Exchange Online with a security certificate to send mail to you. If you decide to configure TLS between your organization and a trusted partner organization, Exchange Online can use forced TLS to create trusted channels of communication. For instructions, see Configure mail flow using connectors in Office 365. However, for businesses that have compliance requirements such as medical, banking, or government organizations, you can configure Exchange Online to require, or force, TLS. Opportunistic TLS is sufficient for most businesses. Unless you configure Exchange Online to ensure that messages to that recipient must use a secure connection, then by default Exchange sends the message without encryption if the recipient's organization doesn't support TLS encryption. Opportunistic TLS means Exchange Online always tries to encrypt connections with the most secure version of TLS first, then works its way down the list of TLS ciphers until it finds one on which both parties can agree. How Microsoft 365 uses TLS between Microsoft 365 and external, trusted partnersīy default, Exchange Online always uses opportunistic TLS. Exchange Online also sends email that you send to other customers over encrypted connections using TLS that are secured using Forward Secrecy. When you send a message to a recipient that is within your organization, Exchange Online automatically sends the message over an encrypted connection using TLS. How Exchange Online uses TLS between Exchange Online customersĮxchange Online servers always encrypt connections to other Exchange Online servers in our data centers with TLS 1.2. We don't recommend email transmission without any encryption. However, you can continue to use an unencrypted SMTP connection without any TLS. To provide the best-in-class encryption to our customers, Microsoft deprecated Transport Layer Security (TLS) versions 1.0 and 1.1 in Office 365 and Office 365 GCC. Keep reading to find out how you can secure all mail to your on-premises servers or important partners by using connectors. Exchange Online always attempts to use TLS first to secure your email but can't if the other party doesn't offer TLS security. Use TLS in situations where you want to set up a secure channel of correspondence between Microsoft and your on-premises organization or another organization, such as a partner. See Email encryption in Office 365 and Message encryption for information on message encryption in Office 365. For example, you can use Microsoft Purview Message Encryption or S/MIME. If you want to encrypt the message, use an encryption technology that encrypts the message contents. So, if you forward a message that was sent through a TLS-encrypted connection to a recipient organization that doesn't support TLS encryption, that message isn't necessarily encrypted. TLS doesn't encrypt the message, just the connection. Once the connection is encrypted, all data sent through that connection is sent through the encrypted channel. For example, TLS is used to encrypt the connection between Exchange Online and your on-premises Exchange servers or your recipients' mail servers. Exchange Online uses TLS to encrypt the connections between Exchange servers and the connections between Exchange servers and other servers. TLS supersedes SSL and is often referred to as SSL 3.1. These protocols secure communication over a network by using security certificates to encrypt a connection between computers. Transport Layer Security (TLS), and Secure Sockets Layer (SSL) that came before TLS, are cryptographic protocols. TLS basics for Microsoft 365 and Exchange Online Learn details about signing up and trial terms. Start now at the Microsoft Purview compliance portal trials hub. If you're not an E5 customer, use the 90-day Microsoft Purview solutions trial to explore how additional Purview capabilities can help your organization manage data security and compliance needs.
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