how do i stop the auto-generated e-mails to all my friends from my account?

Theres an app called "Team App" wherein i registered and created an App for my business thats in tattoos. so now i have an app created by myownself in my business's name "TATTOO REGION APP" they create a subject line "TATTOO REGION SMARTPHONE APP NOW AVAILABLE" and some content basically to promote their own "app" "the Team App" so i just randomly selected 50-60 people and sent them this mail. NOW, whats happening is , every single day, every hour, every minute theres some auto-generated email with the same SUBJECT as above sent to all the 50-60 people and its **** them off and since this email is sent in the name of my business name its kind of affecting the image of my business and i need to take action immediately. its already been 3 weeks since these mails have been attacking my fellow friends and myself too. i get notifications about the same too. kindly find me a solution to the same and if any other queries pls contact me on 9920933369 OR email at *** Email address is removed for privacy *** Thank You awaiting Reply.