The databases used in many Email Marketing campaigns include invalid email addresses. The problem with this is that emails to invalid addresses are charged by the operators, drastically impacting the effectiveness of campaigns. Not only that, the reputation of the email address that sends the campaigns and the IP of the email service that sends them can be degraded, which can affect the speed of sending, and in some cases the email service can be blocked. That is why carrying out an email address validation process is of vital importance. With Go4clients you will be able to verify thousands of records in seconds, simply uploading your database and after one click you will receive a report with the information of valid email addresses, and use only those that exist and pay for messages that will be delivered to users.