This practice has circulated quietly for years within postal worker communities. It remains one of the simplest, safest, and most affordable preventative measures available. It is non toxic, inexpensive, easy to apply, and accessible to nearly everyone. Most importantly, it does not introduce harmful chemicals that could affect people, pets, or mail.
What the Dryer Sheet Really Means
It is likely:
A preventative action taken by your mail carrier to avoid being stung
A quiet warning that there may already be insect activity nearby
A respectful request asking you to inspect your mailbox for potential nests
It is not litter and it is not a prank. It is a thoughtful gesture of protection that benefits everyone who uses that mailbox including your family, your neighbors, and even delivery workers who follow the same route.
Wasps are highly territorial and can become aggressive when disturbed. A mailbox provides the perfect sheltered environment for them, making it one of the most common nesting spots. For a carrier who must open hundreds of mailboxes each day, one hidden nest can quickly turn into a serious medical emergency.
