By default, emails sent to patients through Ocean will be sent from "firstname.lastname@example.org". You can change this setting so that your patients know that the email is coming from your clinic.
You can do this by logging in to the Ocean portal and navigating to the the Admin tab. Type in your clinic name in the "Email Friendly Name" field and save your changes.
Note: You may also need to update your clinic name in your email templates as well.
To do so, enter the Patients tab of the Ocean portal. Click on any patient and select "Email Patient...". Update the clinic name in your template (e.g. in the subject line or the email body) and click "Update Template" at the bottom to save your changes.