there are one or two ways to skin this cat
1) Go with the USPS Express Delivery...it is expensive but seems to work quite well for letters and Documents
2) Private mail service like EPS( YUK!!) or Business Mail (a little Better) or one of the missionary services like AGAPE out of Sarasota FL. They charge membership fees and the first two charge by weight....But service is safe and relitively fast.
the advantages of using a private service are in service, speed and security. AND, they will get larger packages out of Customs, usually at very advantageous cost.
HB