I'm currently building an app where I need to large amounts of emails to lots of people at as close to the same time as possible (for example: think ~500 people, and they should all get their specialized email as close to 5:00pm as possible). The reason I need this (is not because I am spamming people, but) is because I am essentially building a notification system. If there are currently 500 people on my platform, then about 2000 emails will be send on one Saturday, about 500 at a time. My current idea (mostly because it's highly cost efficient) is to use Amazon SES because it is only $0.10/1000 emails, however, it seems that there may be a max per second on it (and I know I'd have to get approved for higher daily rates anyways), and that's a little slower than I'm wanting (I really wish I could just send everyone an email exactly at 5:00pm on the dot, but it seems that may not be possible). Any help or resources would be welcomed greatly!