She’s Ponyville’s official Messenger Dragon now that I’ve moved to Canterlot. Makes it easy to stay in touch… or just send funny jokes to each other at completely random times.

-Spike

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Excerpt from the Historical Archives:

“One year after the coronation of Princess Twilight Sparkle as ruler of Equestria, her majesty put forward a Collaborative Dragon Communications Initiative with the help of Dragon Lord Ember., known more simple as the "Messenger Dragons”. The system was inspired by the direct line of communication established between Canterlot and Ponyville through the use of specialized dragon magic, the “sending flame”. Now any allied nation can be assigned their own designated Messenger Dragon, allowing for instant letter delivery to governing bodies for any time-critical messages like alerts, news and the occasional Gala invitation. "