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% replaces any number of letters (la% - lake, lamp)_ replaces one letter (ca_ - car, cat)

Crossword clues for Some mail services: Abbr.:

RPO: Mail service: Abbr.
DPO: Mail-service abbr.
RFDS: Some mail services: Abbr.
RFD: Remote mail service: Abbr.
APO: Service mail drop: Abbr.
RFD: Mail service in the sticks (abbr.)