demanding mail carriers to use side walks to deliver mail and not the use of cutting across lawns kept up by tennants/property owners

everyday mail carriers use my yard as a shortcut to there delivery of mail. im strongly agaianst this because of the up keep and the exspence that i provide. keeping a property to its beauty mostly comes from lawncare. damaging lawns by tampering over the dead path daily can be very costly to tennant/property owners.sidewalks are secure and provided by the property owners. whether its to make ur job less time consuming or walking distance shorter no tennant/property owners lawn should suffer or be subject to neglect