If you’re dealing with Personal Health Information (PHI), and as therapists, we are, it’s important to use an email that is in compliance with HIPAA. There are more and more services offering HIPAA compliant email, but I recommend using Google’s G Suite. G Suite is Google’s set of really useful applications including Gmail, Google Drive (for storing and sharing files,) Google Docs and Calendar, which is offered for $5/month per user.