Opening at the post office ... or, when read as three words, a hint to the answers to the starred clues, 10 letters - Crossword clues, answers, solver

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Answer for the clue "Opening at the post office ... or, when read as three words, a hint to the answers to the starred clues ", 10 letters:
letterdrop

Alternative clues for the word letterdrop

Apt phrase spelled by the deleted ends of this puzzle's theme answers
It may be used to pass secrets
Post hole?
Slot at the post office
Slot for mail
Front door opening
Post office convenience
Snail mail box