From the docs about the Email adress capture info card The EmailAddress type is used to extract an email address value from the user's input and save it in a variable of type string. This allows you to use the extracted email address in other parts of your bot's logic, such as sending an email confirmation or storing the email address for future use. The email address can be in any valid email address format, including with special characters such as dots, hyphens, and underscores.