can I send a password protected email ?

Hello djsflyer,

Welcome to Apple Support Communities! We understand you want to send a password protected email. We're happy to answer this for you.

You may need to contact your email service provider for additional options. For example, Gmail has documentation on how to do so: Send & open confidential emails - Computer - Gmail Help

If you don't have these options, you can use encrypted emails: Sign or encrypt emails for increased security in Mail on Mac

Best Regards.