Based on traceroutes and IP ownership Mailgun appears to have migrated mostly to AWS (web app, DNS, SMTP relay) but still uses some Rackspace infrastructure; em

Based on traceroutes and IP ownership Mailgun appears to have migrated mostly to AWS (web app, DNS, SMTP relay) but still uses some Rackspace infrastructure; emails delivered from my Mailgun account come from the Rackspace data center in Chicago.