I congratulate the Mailgun team and I wish them all the best, but Rackspace's previous acquisitions bode ill for the future of Mailgun.<p>Rackspace acquired CloudKick in late 2010 and Anso Labs in February of 2011. Both teams must have been put on other projects, because their products have stagnated. CloudKick no longer lets people sign up. Their blog, <a href="https://www.cloudkick.com/blog/" rel="nofollow">https://www.cloudkick.com/blog/</a>, has broken images and few updates. I couldn't find any products by Anso Labs, so I googled the founders. It looks like they no longer work at Rackspace: <a href="http://gigaom.com/cloud/openstack-developers-leave-rackspace-for-nebula/" rel="nofollow">http://gigaom.com/cloud/openstack-developers-leave-rackspace...</a><p>Again I wish the best for Mailgun, but I really hope they know what they're getting into. If I were a customer, I would be wary right now.