by return post meaning

• [American slang]
  Go to by return mail.

• ex post return:    [Finance]Related: ...
• in return:    Adverb: in return( ...
• in return for:    [American slang]by ...

Examples

1. Michael Carlson, who contributed to " Origins " and corresponded with Corman starting in the 1980s, described Corman's correspondence this way : " In the days before email his words came by return post, aerogrammes densely typed to take advantage of every inch of space, or postcards printed in his fine hand.
2. "That's absolutely why I found the script fascinating, " said Ben Chaplin, the gifted young British actor ( " Washington Square " ) who stars in the film as a painfully shy bank clerk who writes away for a Russian mail-order bride and gets Nadia ( Nicole Kidman ) by return post.