If you want to send email notifications (like case status change, Lead creation) to the customers from your corporate email for branding or don’t want to expose the sales or service personal email then

1. Create a service emailbox in the corporate email service
2. go to Salesforce Organization-Wide Addresses
3. Set User Selectable Organization-Wide Email Addresses and get it verified
4. This email address will then automatically be avaialble for selection in workflow email alert and flow email alert.

This’s it. Customers will get the notification from the defined corporate branded email id