I've asked the PO and Banks if there is any difference in the security of either. They both say NO as you have to pay cash for both and both are backed by the institution issuing them. Also you can't just buy one and then just cancel it without cause and if customer complains of non-payment you're the one they look into for fraud . I know there are postal inspectors but the bank will prosecute on their end also IF one of their customers is fraudelent . Does anyone POSITIVELY know if one is more secure or are we working under misconceptions ???? I keep getting people who will only take postal MO which are a problem for me as I have to go to the bank to get cash(I could have got the MO then !!!!) and then go to the Post Office to buy their MO. Please post facts only PLEASE . Thank you