Hitler always liked his self-made title "The Fuhrer". I'm just wondering if other world leaders actually called him "My Fuhrer"? Because that would imply some form of obsequiousness, when they call him "My Fuhrer" or did they go with "Dear Chancellor Hitler" or even "Dear Mr. Hitler" ?
Edit: typo
It depends. "(Mein) Fuhrer" was mainly reserved those within the Third Reich. If I'm not mistaken, Churchill referred to Hitler in speeches as "Herr Hitler" or just "Hitler." Allies rarely addressed Hitler as "Chancellor" or "Excellency" any longer when hostilities began in earnest.
In letters how did heads of state address Hitler?:
Mussolini (1943): "Fuhrer" (Hitler (1941) addressed Mussolini as Duce )
The leaders of countries who were allied to or under the control of the control of the Third Reich, like Romania's Ion Antonescu would likely have personally addressed Hitler simply as "Fuhrer" since this was Hitler's preferred title.
Roosevelt (1938?): "His Excellency Adolf Hitler, Chancellor of the German Reich"