Validation is very important to avoid being marked as a spammer or being blacklisted. If you are paying to top Email Marketing Clients like Mail Chimp, Aweber etc. then this part is not necessary. But if you have got millions of Email addresses or you are running some other Bulk Email Clients which are hosted on your server then you probably you need these steps before launching any email campaign. We will discuss about these in detail later in chapter “Service Providersâ€
Validation rules verify that the data a user enters in a record meets the standards you specify before the user can save the record. A validation rule can contain a formula or expression that evaluates the data in one or more fields and returns a value of “True†or “Falseâ€