Thanks to his linguistic skills, he served in a diplomatic capacity during Russia's wars with Turkey and France.

At the Congress of Vienna in 1815, Bulgakov assisted the Russian Tsar Alexander I and the Foreign Minister.

As Director of Saint Petersburg Posts, Bulgakov worked there with Prince Golitsyn, who was in charge of the Russian Postal Department.

[3] Among Bulgakov's innovations was the establishment of passenger-carrying mail-coaches between the major towns of Russia and the Baltic provinces.

The Dowager Empress Maria Feodorovna, the widow of Paul I and a former German princess, praised the better postal service.

[citation needed] Bulgakov paid much attention to improve working conditions for postal workers.