Hey,
2 Millions email per day means you should have a lot's of IP steady and ready for rotation....
Sending 2 Millions email per day is not even the problem...
First, if you really want your mails to get delivered to that amount of subscribers in a day, your list must be permission based list. The reason goes thus; once you start sending that kind of mails to a not permission based list... Most ISP/ESP would start rejecting/blocking your mails from delivering making them to stay in queue..
Secondly, it does matter your IP reputation.....
Anyways, let's see if this could be handled....
What is your server SPEC?
Also, is it a cpanel based server?
OR do we say you are yet to get a server but need one?
Thank you!