The letter that arrived at the State Bar of Georgia in April 2016 containing a white powdery substance contained an ominous threat.

“We will kill of all you. … Have some 'anthrax,'” it said, according to federal court records.

Federal authorities said Tuesday that the man who sent that letter, Travis Ball, 50, has been sentenced to two years in federal prison for mailing the threat, which did not contain actual anthrax.