Group V elements (Nitrogen, Phosphorus, Antimony, Arsenic and Bismuth) have allotropic forms.
The Antimony in particular that exists in its common most stable form at room temperature is called alpha Antimony and has a boiling point of 1587o C
In addition there are 5 other forms of Sb, two of which are formed at higher pressures and show the higher BP of something over 1600oC, depending upon the pressure.
So Greenwood and Earnshaw have the alpha form (Chemistry of the Elemnts) - 1587o C
Lange has the types I and II forms - (Handbook of Chemistry) - 1640oC
Yes metal vapour is given off by the boiling substance.
Antimony also exhibits an unstable form which gives off an explosive gas form.