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I'm trying to send a basic verification email using Laravel and an account on mailgun.com. I've followed the instructions here  and am getting errors. here's my code:

public function postCreate(){
		$validator = Validator::make(Input::all(), 
			array(
				'email'		 		=> 'required|max:50|email|unique:users',
				'username' 			=> 'required|alpha_dash|max:60|min:3|unique:users',
				'password' 			=> 'required|min:6',
				'password_again' 	=> 'required|same:password'
			)
		);

if($validator->fails()){
			return Redirect::route('account-create')
					->withErrors($validator)
					->withInput();
		} else {

// Create Account
			$email 			= Input::get('email');
			$username 		= Input::get('username');
			$password 		= Input::get('password');

// Activation Code
			$code 			= str_random(60);

$user 			= User::create(array(
				'email' 	=> $email,
				'username' 	=> $username,
				'password' 	=> $password,
				'password' 	=> Hash::make($password),
				'code' 		=> $code,
				'active' 	=> 0
			));

if($user){
				// Send Email
				Mail::send('emails.auth.activate', array('link' => URL::route('account-activate', $code), 'username' => $username), function($message) use ($user) {
					$message->to($user->email, $user->username)->subject('Acivate Your Account');
				});

return Redirect::route('home')
					->with('global', 'Your account has been created. We have sent you an email to activate your account');
			}
		}

}

My Error Message
Client error response [url] https://api.mailgun.net/v2/mydomain.com/messages.mime [status code] 404 [reason phrase] NOT FOUND