Contact the US Postal Inspection Service office by dialing 1-877-876-2455 ext. 4 from 8 a.m. to 4:30 p.m. in all time zones.
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.
All major banking institutions have a dept. that investigates fraud offenses.
USA
a federal agency that investigates complaints of employment discrimination
The EFCC (Economic and Financial Crimes Commission) is a Nigerian law enforcement agency that investigates financial crimes such as advance fee fraud (419 fraud) and money laundering. The current Executive Chairman is Farida Mzamber Waziri.
Perhaps not "mail fraud" as such but certainly fraudulent.
The US Postal Inspection Service.
The police
The mail fraud statute of limitations is typically five years from the date the fraudulent activity occurred.
Government agency of which country are you asking about. Please make your questions precise if you want us to answer them for you.
The NTSB (National Transportation Safety Board).
an IRS agent is a person that investigates any fraud or missed filling on your income tax returns.