Sending beer without a license is against shipping companies' policies, so any trading you do is at your own risk. That being said, it's common knowledge among people working for FedEx, UPS and even USPS that people actively trade and ship beer. It's a good idea to open a shipping account with either FedEx or UPS.
Beer, wine, and liquor may not be sent through the mail, except in limited circumstances. Please note, if you want to reuse a box that has alcoholic beverage labels on it, remove all logos and labels so your package will pass through the mail system.
Quick Tips; How to Ship Beer in the Mail Use a sturdy double-walled box, or put one box inside another. Use plenty of filler material. Packing peanuts and bubble wrap work best. Make sure no glass is touching.