Hi Touseef
I hope i can help you
A business process is simply called a Process in OutSystems and is understood as the way that a particular task is carried out in your organization, such as handling invoices, processing orders, or handling complaints. Processes are also known as BPT (Business Process Technology
https://www.outsystems.com/use-cases/digital-operations/
Create logic for sending emails to the Logic tab and create a new server action by right-clicking Server Actions and selecting Add Server Action from the menu. ...Drag the Send Email action to the flow. ...Go to the Send Email properties action and select your Email in the Email list.
https://success.outsystems.com/Documentation/11/Developing_an_Application/Implement_Application_Logic/Emails_in_Mobile_and_Reactive_Web_Apps/Sending_emails
Thanks&Regards
Himanshu