We run an Australian betting tips website named Punters Page. Our developers installed an emailing system into our dashboard so that we could email our tips to the email addresses of our active subscribers.
Problem is, they ran it via Gmail, which has a 99 user limit. We have researched and would like to use the service MailGun in order to send high volumes of emails with no problems at all.
This needs to be done with 24 hours, 48 hours at the most.
I have reason to believe most of the code has been implemented already.