By default, all emails sent from your account to your clients and staff are sent from service@casefox.com.  If you link your Google or Office365 account,  these emails are sent from your own Google or Office 365 account.  Alternatively, under Invoice/General Settings, you may also setup your own SMTP server.  Once successfully setup, invoices and emails from your account to your clients and staff will be sent through your SMTP server.