Thierry Jérôme, 54, caused panic among France’s political class in 2009 when he sent around 40 threatening letters along with bullets to the country's top politicians.
The former president Sarkozy and former Prime Minister François Fillon were his two most high profile victims.
Other recipients of his threats included former ministers Rachida Dati, Michèle Alliot-Marie and Christine Albanel.
Jérôme, who suffers from psychiatric problems, also sent similar parcels to French media companies TF1 and AFP. He signed off all his letters with the signature “cell 34”.
Jérôme was handed a one year suspended jail sentence by a Paris court, French radio Europe1 reported on Tuesday. He was also ordered to seek psychiatric help and banned from owning a firearm for five years.
According to Europe1, a psychiatric assessment of Jérôme determined he was "a danger to himself and to others".