causes the mails to be used
Defined in 1 dictionary — Case Law
Definitions from Case Law
United States Supreme Court
Where one does an act with knowledge that the use of the mails will follow in the ordinary course of business, or where such use can reasonably be foreseen, even though not actually intended, then he 'causes' the mails to be used.
Defined by the Supreme Court in - Pereira v. United States, 347 U.S. 1 (1954).