[dbrush]

The first and largest obligation that Dropbox has is to their users, not to one of the many partnership emails they probably get constantly.

Really, your last sentence there is unnecessary.

[kapitti]

If you're posting a bizdev email, I would just assume you would respond, even if it's with a "Sorry, we're heads down on other stuff" response.

3 weeks without a response makes me think they don't even bother reading it.