Lua Code:
MiniMapMailFrame:ClearAllPoints()
MiniMapMailFrame:SetPoint("TOPLEFT", Minimap,"TOPLEFT", -29, -18)
MiniMapMailFrame:SetScale(1.35)
MiniMapMailFrame.SetPoint = function() end
"MiniMapMailFrame" could be any icon around minimap,
u can use /fstack CMD in game to get all frame's name.
It works for me in classic.