Additionally, the Encrypt-Only feature (the option under the Encrypt button) is only enabled for subscribers (Microsoft 365 Apps for enterprise users) that also use Exchange Online. Microsoft 365 Message Encryption is part of the Office 365 Enterprise E3 license. In an email message, choose Options, select Encrypt and pick the encryption that has the restrictions you want to enforce, such as Encrypt-Only or Do Not Forward. If you are a Microsoft 365 subscriber, here is what is new to you:

In an email message, choose Options, select Permissions.įinish composing your email and then choose Send.Įncrypt with Microsoft 365 Message Encryption You'll see an Encrypt with S/MIME if you have an S/MIME certificate installed on your computer. In an email message, choose Options, select Encrypt and pick Encrypt with S/MIME option from the drop down, If you are an Office Insider with Microsoft 365 subscription, here's what is new to you: Under Certificates and Algorithms, click Choose and select the S/MIME certificate.

Under the File menu, select Options > Trust Center > Trust Center Settings. Once you have your signing certificate set up on your computer, you'll need to configure it in Outlook.

The S/MIME option is only visible if you have S/MIME certificate configured in Outlook.įor detailed instructions on adding encryption check Encrypting with S/MIME or Encrypt with Microsoft 365 Message Encryption.īefore you start this procedure, you must first have added a certificate to the keychain on your computer. The new Encrypt button contains both encryption options (S/MIME and IRM). The Permissions button is replaced with the Encrypt button. This feature is available only to Microsoft 365 Subscribers for Windows desktop clients. With the new Office update, email encryption in Outlook got better. New Encrypt button and updates to email encryption The same applies for IRM-protected messages users should not sign or encrypt them by using S/MIME. To apply IRM protection, S/MIME signature and encryption must be removed from the message. IRM protection should not be applied to a message that is already signed or encrypted using S/MIME. Microsoft 365 Message Encryption (Information Rights Management) - To use Microsoft 365 Message Encryption, the sender must have Microsoft 365 Message Encryption, which is included in the Office 365 Enterprise E3 license. S/MIME encryption - To use S/MIME encryption, the sender and recipient must have a mail application that supports the S/MIME standard. Any recipient without the corresponding private key, however, sees indecipherable text. Only the recipient who has the private key that matches the public key used to encrypt the message can decipher the message for reading. Encrypting an email message in Outlook means it's converted from readable plain text into scrambled cipher text. When you need to protect the privacy of an email message, encrypt it.

Office 365 e3 security