The email would be detected as spam. You need to use a trusted email service for that many emails. Like Amazon. The links in the email need to reference the same domain that is sending it. So you need to set up the correct dns settings. A few more rules to follow and the email won't end up in junk or spam. Maybe it still ends up in the promotions folder.

To be legal in the US you need to allow them to unsubscribe. So I wrote a web service to do that.

All I need to do now is write the script to send them all out and make a promotional video to go with it explaining everything.

Should be done in the next few weeks.