When designing the process flow of your process, you can send electronic mails (Email). This behavior is implemented through the Send Email process activity which you can drag onto your canvas from the Process Flow Toolbox.
At runtime, Emails are asynchronously sent by the OutSystems Platform as follows:
The Email content is rendered from the Email Screen that is specified in the Email property;
The resulting Email is added to a sending queue and the application continues executing;
The OutSystems Scheduler Service regularly checks the sending queue and sends pending emails.
To handle Email addresses use the Email data type and Email built-in functions.
About Email | Send Email Properties | Process Flow Toolbox