When the site is running, at points where email should be sent such as sending a contact message, requesting a password reset or making an order, emails aren't sent. Instead, the text of the email appears in a popup on screen.
This is because the email is configured in TEST mode. You can switch the method used for email from the general.email.method config setting. Set it to 'on' to activate email, 'off' to stop emails being sent and 'write' for mails to be written to the screen.
You will generally need to set the other mail-related config settings too. If you go to the config section and search or navigate to general.email, you will see all the email settings.