After being without power and Internet, things have now returned to normal at Freetronics HQ so I've been able to ship orders again this week.
Please note that I still can't ship international orders as "letter" class. That option is displayed at checkout for small items because the shipping calculator still thinks it's valid, but Australia Post won't accept them.
I have customers placing orders using "International Letter" as the shipping method all the time, and I always have to cancel the order and provide a refund. Please don't select that method! If I could disable the option in the shopping cart, I would.
International orders are fine at "Standard" class or above though.
Thanks for your patience!