Crossword Genius

Series of numbers or letters that aid in sorting and delivering mail (8)

Ross

I believe the answer is:

postcode

(Other definitions for postcode that I've seen before include "Letter sorting device (or kind of modern lottery?)" , "Mail sorting help" , "Address identifier" , "Conclusion of address" , "Eg, E-Nine-Eight One-T-T" .)

I've seen this clue in the Sydney Morning Herald.
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