Probably best to have this conversation elsewhere. Feel free to email sales@mailgunhq.com.

You really should consider making this public. It is the why part of your Unique Value Proposition[1]. In fact, I'd urge you to make this as obvious as possible on your landing page. And good luck on your enterprise.

[1] http://www.furld.com/2011/lean-canvas-unique-proposition-sol...

I'm also a sendgrid customer and would definitely want to see arguments for mailgun compared to sendgrid...

But I'm not bought yet into mailgun to actually spend time contacting your sales...

I think from a sending/tracking perspective most of the services listed here are somewhat comparable. All of us realize that delivering to inbox is a high priority and we do many of the same things to make sure your infrastructure is optimized to achieve that. In addition, most services have analytics that track your emails. Of course, I am biased on which is best.

From a broader perspective, Mailgun's focus is being a complete mail platform (sending, receiving and storing messages) and integrating email with your application vs. a sending/delivery service. A quick glance at the front pages of the websites reveals that.

I would encourage you to review the documentation of all of the services in order to make the decision of what is right for you.