I've searched online for the restrictions but failed to find a page that outlined it. It would be greatly appreciated if someone could find a page that describe that.
mmmmm... all the info I know of this topic is that it can't be some sort of fruit/veggie nor a meat product and you have to put a parcel label indicating that you're sending food! - That's if you're sending it as a personal package. To know more info just go to a post office and ask them of the rules, they'll be more resourceful!! :P
There's usually no trouble sending anything that's pre-packaged and non-perishable ... excluding alcohol.