In MainBrainer, Email Trigger Templates are used in the implementation of a single opt-in signup process to auto-send an Email when a customer signs up his/her Email address to receive Email communication from you.
For example, if you wish to send new signups a signup confirmation Email or a welcome coupon, etc. In such cases, create an Email trigger template with the relevant details, and trigger it from your landing page.
Add a Signup Form widget to your Landing Page. Next, click on the Fields tab, and expand the settings for the Email field. Use the dropdown menu highlighted in the screenshot below to select the Email Trigger Template that you would like to be triggered when a customer clicks the Submit button.