Formatting emails is very much needed to clean your list from bad, dead email addresses. For example, when you are using your email list, there might be many wrongly typed email addresses in your list, some typo errors, syntax errors and possible some bouncing email addresses. On an average, every year, 22.5% email addresses get deactivated, banned or deleted. It can be a bad news if you are one of the victim dealing with an old email list.