Do you know how to use the email encryption options in Outlook? Its disarmingly easy and you should be very familiar with these functions. Here's a Microsoft article on the topic - and a screen print which will guide you to the functions available when sending an individual message (you can also turn encryption on for all messages)..
PLEASE NOTE: You will need a digital ID to enable encryption, which would be added to Outlook. Here is a list created by Microsoft of digital ID providers.
PLEASE NOTE: You will need a digital ID to enable encryption, which would be added to Outlook. Here is a list created by Microsoft of digital ID providers.