Dear Representative of the Ponyville Postal Services,
You are an incompetent gathering of three month old afterbirth! Not only do you have the nerve to tell me I can't mail live bunnies to Zebrabwe, you can't even deliver something as important and valuable as a Grand Galloping Gala ticket to me on time! You incompetent boobs are so terrible at your jobs, I feel like I owe poor Fax Machine an apology; apparently if he didn't send Twilight's letters to Celestia for her, she'd never recieve them!
In response to your letter, though, I haven't seen your mail colt. I'm sure he'll turn up. Oh, don't worry if he's speaking backwards when you find him, that'll wear off.
Yours sincerely, Discord.