In the new email window you can type your email like you would normally. In this example, I am sending this to my personal Gmail account to demonstrate the experience of an external contact.
NOTE: All of our email traffic is encrypted by default using TLS 1.2, encrypting the message with Outlook does add an extra layer of security to all email messages.
You can encrypt a message the same way when sending internally, but the person you're emailing will not have to go through the extra steps to view the message that we'll see below.