The first (and easiest option) is to simply try to encrypt the email you are sending with Office 365 built-in encryption. This works on some emails and documents but not all of them depending on the format and complexity of the PII. To do this use the following steps-
From the Outlook desktop client:
With the message you are attempting to send opened in a full window (not preview), click Options, Encrypt, and then Encrypt-Only before sending the message.
From Outlook Web Access:
Log in to https://outlook.com/frostburg.edu with your FSU email account, and then click on the new message or reply to message button. Right next to Attach, there is an Encrypt link, click on it before sending the message.
If the emails are still being blocked from sending, the next option is to create a Microsoft Word document or an Adobe PDF file that contains the information. You will then encrypt the file with a password and send that password to the recipient separately. Here are instructions for doing that-
For Microsoft Word or Excel Documents:
First, open or create the Office document you would like to protect. Click the File menu, select the Info tab, then select the Protect Document button. Click Encrypt with Password.
Enter your password then click OK.
Enter the password again to confirm it and click OK.
Microsoft Word will now indicate the document is protected. Each time you open the document, you will be prompted to enter your password to access its contents.
For Adobe PDF Documents:
Open or create the PDF, then click the File menu followed by Properties
Click the Security tab, then click the drop-down menu beside Security Method, and select Password Security from the list of resulting list of options.
Select Require A Password To Open The Document, then type the password in the corresponding field. For each keystroke, the password strength meter evaluates your password and indicates the password strength.
Click OK, and then confirm the password.
Click OK again and notice that you must save the PDF before your changes take effect.
Click OK on the Properties dialog and save your work.