I think you were getting down voted because its not the kind of comment folks come to HN to read. It sounds like from this comment that you're a competitor? ("that's my daily business")
There is a lot of information on mailgun, both on HN and on the web. They've made no secret of the problem space they were going after.
So Rackspace felt like they were worth acquiring, the product and customers are supported so its not a strict acquihire exit, and while the questions about sendgrid are good here (which are proxies for "What is Rackspace's strategy as a services provider really?") there clearly was enough to Mailgun to make this worthwhile. That you don't "get it" is ok but instead of the snarky "Soo they just send email?" kind of thing why not dig into their product and ask specifically about it? If it seems un-remarkable then talking about how you implement the same features and qualifying the scale of that would be helpful too.
There is a lot of information on mailgun, both on HN and on the web. They've made no secret of the problem space they were going after.
So Rackspace felt like they were worth acquiring, the product and customers are supported so its not a strict acquihire exit, and while the questions about sendgrid are good here (which are proxies for "What is Rackspace's strategy as a services provider really?") there clearly was enough to Mailgun to make this worthwhile. That you don't "get it" is ok but instead of the snarky "Soo they just send email?" kind of thing why not dig into their product and ask specifically about it? If it seems un-remarkable then talking about how you implement the same features and qualifying the scale of that would be helpful too.