If you have a Trinity email, it now includes encryption features that let you share your confidential and personal information while ensuring that your email message stays encrypted and doesn’t leave Microsoft 365. This is useful when you don’t trust the recipient’s email provider to be secure. No pre-registration or extra software is required.

How do I send a secure email with Office 365 Message Encryption?

Your message will be encrypted by simply putting the word Confidential in the subject line of your Trinity email. Encryption can also be activated by selecting the Encrypt function from the Outlook Mail client or Office 365 Outlook on the web. See below for details.

** NOTE:

  • The subject line of the email is not encrypted; therefore, you should not include sensitive information in the subject line of the email.
  • If sending to someone outside the Trinity domain without an @trincoll email, they may have to register the first time he/she uses the encryption service. You may want to send a message informing them that an encrypted message is coming. A sample of a secure email notification is available below.

Microsoft 365 Message Encryption for Windows

Outlook for Microsoft 365, Outlook 2021, Outlook 2019, Outlook 2016, Outlook 2013, Outlook 2010 – (Source Info)

  1. In message that you are composing, click File > Properties.
  2. Click Security Settings, and then select the Encrypt message contents and attachments check box.
  3. Compose your message, and then click Send.

Microsoft 365 Message Encryption for Mac

Outlook for Microsoft 365 for Mac Outlook 2021 for Mac Outlook 2019 for Mac Outlook 2016 for Mac Outlook for Mac 2011 – (Source Info)
  1. In an email message, choose Options
  2. Select Encrypt
  3. Pick the encryption option that has the restrictions you’d like to enforce, such as Do Not Forward or Encrypt-Only.

For Outlook for Mac 2019, 2016, and 2011 – (Source Info)

  1. ­In an email message, select Options > Permissions and pick the encryption option that has the restrictions you’d like to enforce, such as Do Not Forward. Note: The Encrypt-Only feature is not enabled in these versions of Outlook for Mac.