How safe is sending cash by mail ?
It is pretty safe there a few steps to take before you send money in cash by mail.
Send money in a normal envelope which does not attract the eye, forget the fancy letters!
Put the money between several layers of paper so have can not see through the letter.
The best is to put a sheet of aluminum.
Put a return address on the back of the letter, that way if the mail gets lost, it will be returned to the sender.
TheBitcoinMarket currently only accept payment in euros, I have not found better for the moment, if you remain anonymous is the best solution!!!
If you follow these few basic principles, there will be no problems and the transaction will be fluid.