I have CP set to send me cc's of all emails.
When I get an order I get the admin notification and also the notification that goes to user. If the order is no charge (free ad), the %author% uses my (admin) username. If it is a paid it it works correctly and puts in the users username.
Hi Used Mustangs,
This email confirms that you have purchased the following items:
1969 Mustang Fastback
Used Mustangs For Sale
This is on http://usedmustangsforsale.com/
You can test it yourself by placing a free ad but please delete it when done.