Perhaps not "mail fraud" as such but certainly fraudulent.
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Mail fraud is a federal crime investigated by the FBI and the
Postal Inspection Service- the post office's police agency. Start
by contacting these agencies.
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Yes, in the United States, check fraud is a federal offense.
This goes for both wire fraud and mail fraud.
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I think mail fraud is a felony everywhere, but I know for a fact
that it is a felony in New York.