Email is akin to a postcard; anyone can read it. This is unacceptable when discussing your health information.
Dr. Sellers has arranged to use a service which encrypts our emails.
The first time you receive an email from Dr. Sellers and "click" to open it, your computer will attempt to contact Network Solutions (the email security service). You will be asked to register your email address by providing a unique password. (see below "MessageGuard Enrollment). Once you have done this, you will be able to receive and send secure/private email to Dr. Sellers (see "Using MessageGuard").
Send an email to mail@drsellers.net with REGISTRATION in the subject line. You will receive a reply which will enable you to send secure email to Dr. Sellers.
Remember, email is not for emergencies or truly urgent matters.