A: Thanks for the query. If you submit the same email multiple times, the system will go through the verification process multiple times using all the resources needed. Also, the status of many emails can change in a short time. So, regular verification is always recommended. So, is an email uploaded twice or multiple times, you will be charged everytime. If you do not want to verify an email twice, you will need to clean it before uploading it to our system. Let us know if you have any suggestions. Have a great day.