A Texas landlord's case before the U.S. Supreme Court is challenging the U.S. Postal Service's exemption from lawsuits over lost or mishandled mail. The landlord alleges her mail was deliberately withheld for two years. The Postal Service argues that allowing such lawsuits could lead to a flood of litigation. During oral arguments last month, a government lawyer warned of numerous lawsuits if the court rules in the landlord's favor. However, the landlord's attorney claims such cases would be rare. The Supreme Court's decision could redefine the Postal Service's liability under the Federal Tort Claims Act.