Casino Gambling Emailing software Please suggest me

Hello Support

I am getting troubleshoot while sending Emails can anyone Suggest me a Best software For sending Casino Gaming Industry Newsletters I Had Already Tried mail Chimp, Web mailer, Mail up, Aweber etc but But Still getting problem

please help Us We have to send emails To 7k Subscribers without Spamming Email

Please suggest Nice if anyone have in Mind

Thanks
Thammavongsa Melroy