Ask HN: Inverse of SendGrid.com

SendGrid replaces _outbound_ email infrastructure. I'm interested in something similar for _inbound_ email. The key is that I need to be able to create and delete accounts through a simple API. The use case is that I want to setup emails as an intake to my app. The emails will only ever be read by machines, so a full-featured hosted email solution is not necessary. Rackspace offers a $2/mailbox per month solution. A per/inbox price is probably not viable. Something with (nearly) unlimited accounts where you pay more for more storage is much preferred.

(Why don't I just setup my own box? A slick cloud service could potentially get me going much quicker.)