Rackspace is going to acquire a two-year-old Y Combinator e-mail start-up called Mailgun.
Terms were not disclosed but, aside from Y’s seeding, it looks like the fledgling only raised $1.1 million last year.
Mailgun provides a web service for integrating e-mail inboxes into apps like Twilio lets developers build voice and SMS in their apps.
It says it enables functionality like private user mailboxes, photo uploads from cell phones, e-mail-driven comments and discussion groups.
Rackspace says the deal will let it offer cloud-based e-mail services in applications and web sites.