An email validation service is a tool used to verify the validity and deliverability of an email address. The service typically checks the email address against a set of rules or standards, such as the correct format of the address and the existence of the domain name. It may also check for the presence of a mail server for the domain and attempt to send a test message to the address to confirm its deliverability. Email validation services can be used to help ensure that email campaigns are sent to valid and active addresses, reducing the likelihood of bounce backs and improving overall deliverability
As a marketer you are going to want to protect your email sender reputation and increase your deliverability rates. Deliverability leads to more opened emails and click throughs, which leads to more conversions. You should always use an email validation service to clean your email addresses.