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The recipient opens the HTML attachment in the email message, recognizes a familiar brand if that’s present, and follows When a user sends an email message in Exchange Online that matches an encryption rule, the message is sent out with an HTML attachment. A rule can require the encryption of all messages addressed to a specific recipient, for example.

With Azure RMS set up for an organization, administrators can enable message encryption by defining transport rules that determine the conditionsįor encryption.

If you want to encrypt the message you need to use an encryption technology that encrypts the message contents, for example, something like Office Message Encryption.Office 365 Message Encryption is an online service that’s built on Microsoft Azure Rights Management (Azure RMS). This is because, in simple terms, 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 always attempts to use TLS first to secure your email but cannot always do this if the other party does not offer TLS security.įor Exchange Online, we use TLS to encrypt the connections between our Exchange servers and the connections between our Exchange servers and other servers such as your on-premises Exchange servers or your recipients' mail servers. Is that all correct?Īny pointers to a real description of this stuff and not the confusing (yet technically interesting) type of link as the one I put in above would be appreciated! :)ĭoes this help, its the best explanation I have seen: If so, this means we're good from the sender, through to the far end of the Office 365 infrastructure, leaving only the recipient server and client end in question. I do know it is encrypted in transit between email servers, and presumably it is encrypted from sender to the Office 365 servers, due to Outlook having that Security tab under Account Settings with a (greyed out) checkmark saying "encrypt data between Microsoft Outlook and Microsoft Exchange". So bottom line: if a small business under Office 365 Business Premium asks the question: "Is our email encrypted?", I find myself unable to be certain 100%. I read the following link, and as is often the case, there's plenty about the technology, but nothing about where it is implemented, namely, which subscription level you need to get it. I'm confused about encryption, that either does exist, or not, and where it does and doesn't. I do light Office 365 admin for a number of clients, always under Office 365 Business Premium subscriptions.