Without email, members won’t get email notifications of private conversations, thread updates, forum updates etc. It can also mean admin won’t get emails from members who are trying to get in touch with them using the contact form.
Table prefix is a string of alphanumeric characters prefixed to the name of the tables. XenForo developers have decided against the use of customizable table prefix and have hardcoded it as xf_.
Config.php file has an option to disable emails. All you have to do is add the following line of code in your config file.
Config.php file resides inside the library folder and is used to configure XenForo settings.