You may have multiple email addresses that you use within your practice to send emails such as invoices, consultations, prescriptions, letters or lab results to patients or third parties.
You can set these up by going to Settings > General > Outgoing email:
If you only use one email address for all your outgoing emails, enter this in the 'General email' section:
If however, you use a different email address for different email types, then enter them in the appropriate section as below:
If you do not enter an email address into one of the sections, the outgoing email will be sent from the email address entered in 'General email'.