How money Order work?

Mail fraud refers to any scheme which attempts to unlawfully obtain money or valuables in which the postal system is used at any point in the commission of a criminal offence. Mail fraud is a legal concept in the United States Code which provides for enhanced penalty of any criminally fraudulent activity if it is determined that the activity involved using the United States Postal Service. As in the case of wire fraud, this statute is often used as a basis for a separate federal prosecution of what would otherwise have been only a violation of a state law. The concept is irrelevant and largely non-existent in countries with non-federal legal systems: the activities listed below are likely to be crimes, but the fact that they are carried out by mail makes no difference to which authority may prosecute or the penalties which may be imposed.