Is it possible to get mail id recurringly for 500 users...???

Hi Friends,

Actually we pass parameters like id,email, password (single entity) in json file. And call this json file in gatling script. So suppose we pass 500 requests , only 1 user is being created and rest all are failing , because we have one email id. So one user is being created. So what exactly I want as out put is that email id should change dynamically for 500 times for 500 users( only the email should change , not remaining values).
Can you please help me with the test script.thank you.