Of letters etc (6)
I believe the answer is:
postal
(Other definitions for postal that I've seen before include "Relating to mail service" , "To do with snail mail" , "Type of order" , "To Alps (anag.)" , "Sort of vote" .)
I believe the answer is:
postal
(Other definitions for postal that I've seen before include "Relating to mail service" , "To do with snail mail" , "Type of order" , "To Alps (anag.)" , "Sort of vote" .)