You have to purchase the emails from data center for casino emails and gamblers emails. Then i will provide you a system, from there you will just upload all contacts and triggered the mail and schedule the time. then system will automatically start to sending mail in background process.
I can help you to purchase the email list.
I have 7 years of experience in PHP, Codeigniter, Yii and MySql.
Please ping me on chat and mention you comfortable time to discuss the task list.
I will give you 6 month free support after finish the application.