This article covers the different types of encryption you can use in Outlook 365. For directions on how to send an encrypted e-mail: Sending Encrypted E-mails

Encrypt

1. Protects the contents using encryption

Do Not Forward

1. Prevents the recipients from forwarding the email to anyone else
2. Prevents printing
3. Protects the contents using encryption

Confidential / All-Employees

1. Prevents external recipients from being able to view the email
   
2. Prevents the recipients from forwarding the email to anyone else
3. Prevents printing
4. Protects the contents using encryption.
   

Highly Confidential / All-Employees

1. Prevents external recipients from being able to view the email
2. Prevents the recipients from forwarding the email to anyone else
3. Prevents recipients from replying
4. Prevents printing
5. Protects the contents using encryption.