Feldpost suffix "S"

[taff]

I have a letter and envelope from Feldpost number 20803 - S.
Does anyone have any idea what the "S" suffix stands for?
The envelope is also overstamped "SS Politzie division" and dated 28/4/43.



Feldpost number 20803 - S

(Mobilmachung-1.1.1940) 3. Kompanie Gebirgsjäger-Regiment 100,
(2.1.1940-27.4.1940) gestrichen, wurde Fp.Nr. 24971 D,
(28.4.1940-14.9.1940) Abwehr-Stelle Paris, dann Abwehr-Leitstelle Paris,
(6.4.1944-9.11.1944) 11.9.1944 gestrichen.

Thanks
Taff