What is the definition of Mailing Sounds?

"Mailing sounds" are the auditory after-effects of sending a letter or package through the postal service. It's like the universe is saying, "Hey, you've sent something important, here's a reminder to not drop it." But let's spice things up a bit.

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Here's an edgy example sentence: "The new encryption algorithm's mailing sounds sounded suspiciously like a cross between a crossword puzzle and a caffeinated cat, so we decided to skip it for now."