“return mail”

We have one entry that includes the term return mail.

by return mail

idiom

: immediately by mail

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Challenging Standardized Test Words, Vol. 2

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Play Quordle: Guess all four words in a limited number of tries. Each of your guesses must be a real 5-letter word.
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Blossom Word Game Pick the best words!
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Missing Letter A daily crossword with a twist
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Little Words, Big Vocabulary Quiz Time to sweat the small stuff.