If you are getting the mail and all of a sudden see a dryer sheet in the mailbox, there is a reason for it, but don't worry it's not something bad!
If it happens, it's because the mail person is trying to deter wasps and yellow jackets.
The word is that scented dryer sheets can be used as a preventative measure to help keep the stingers away because fun fact: Wasps typically dislike very aromatic things.
And if you do get wasps, but don't see a dryer sheet....now you know how to get rid of them.