Congress passes laws about what can go through the US mail (which are signed into law by the President).
Postal Inspectors, who work for the U.S. Postal Inspection Service (which falls under the Executive branch of the government) are responsible for enforcing the laws. When dangerous materials are being sent with the intention to harm someone, Homeland Security (usually via the FBI) may get involved. Illicit drugs through the mail might get the DEA involved. Illegal weapons shipments (and illegal alcohol and tobacco) might get the ATF involved.
Yes.
yes
No, it is illegal to mail controlled substances.
No. The International Postal Union regulates the exchange of mail. The postage is collected and affixed at the post office of origin and no stamps of any other country are required.
Through US "Snail" mail, YES. Through Email worldwide, unfortunately not.
The US Mail
(in the US) Yes, you may.
us government..lol
Congress
Canada is the neighbor of the US. The United States regulates everything that goes in and out of Canada. This is because the US is the largest protector and largest trading partner.
I do not believe that the us postal service has a mail mountain.
Noyou cant!