Crossword puzzle clue "routing abbr on an envelope"

Here are the possible solutions for routing abbr on an envelope clue

Answer
Clue
Relevancy
attn
Clue
Envelope's routing abbr.
Routing abbr. on an envelope
Envelope-routing abbr.
Envelope routing indicator (Abbr.)
Routing shorthand on an envelope
Envelope-routing abbreviation
Mail-routing abbr.
zipcode
Clue
Routing number on an envelope

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