Quote Originally Posted by Lady's Human
You CAN take the letter to the postmaster, who will in due course notify the postal inspectors.

Nothing much will come from it, though the sender (if there is a return address) may get a visit from the friendly neighborhood Postal Inspector.

If you want to see how efficient the postal inspectors CAN be, however, send an envelope full of talcum powder. (JK, DO NOT try this)
THATS SICK.. We lived through the anthrax.. you didnt.. And by the way- a postal inspector can arrest you WITHOUT cause..