47-year-old Tami Dee Bachart, of McCall, Idaho, mailed a loaded Ruger Blackhawk .357-caliber handgun in December to an address in Connecticut. The gun discharged while being handled by an employee in a processing center in Springfield, Massachusetts.
The postal worker sought medical attention for ringing ears and stinging hands.
Bachart admitted sending the package but claimed she didn't know the gun was loaded.
Bachart pleaded guilty to mailing injurious articles and causing a firearm to be present in a federal facility. She was sentenced to a year of probation, ordered to serve 200 hours of community service, pay $3,400 in restitution and a $1,000 fine.