Got it as well and first post!
From: "Sprint" <Sprint@sprint.delivery-email.com> Sent: Monday, July 15, 2013 1:04:53 PM GMT -06:00 US/Canada Central Subject: Sprint is making your network better Coming soon to your area: a better, faster, more reliable network.
We're building an all-new network in your area to enhance your 3G service and enable new 4G LTE service. While our construction may cause some service disruptions, you'll soon be able to take advantage of a better, faster, more reliable wireless network.