When defining the action flow of your action, you can send Emails defined in your web flows. This behavior is implemented through the Send Email element which you can drag onto your canvas from the Action 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.
About Emails | Send Email Properties | Action Flow Toolbox