Posts (5)
'posts' is the definition.
(I know this)
This is the entire clue.
(Other definitions for sends that I've seen before include "Causes to go somewhere" , "Despatches" , "Transmits" .)
(Other definitions for poles that I've seen before include "Nationality of citizens of Warsaw" , "North and south" , "People from Warsaw?" , "Ends of the earth" , "East Europeans" .)
'posts' is the definition.
(I know this)
This is all the clue.
(Another definition for mails that I've seen is " Sends by post".)