HARTFORD, Conn. (AP) — As a general rule, it’s difficult to sue the U.S. Postal Service for lost, delayed or mishandled mail.

But a case before the U.S. Supreme Court involving a Texas landlord who alleges her mail was deliberately withheld for two years is looking to challenge that, in a proceeding the cash-strapped Postal Service says could prompt a deluge of lawsuits over the very common, if frustrating, phenomenon of missing mail. That concern takes on particular resonance during the holiday season, when the volume of mail — billions of sentimental items from Christmas cards to Black Friday purchases — ramps up.

The case focuses on whether the special postal exemption to the Federal Tort Claims Act applies when postal employees intentionally fail to deliver letters and packages.

“We’re going to be faced with, I think, a ton of suits about mail,” Frederick Liu, assistant to the Solicitor General for the Department of Justice, warned the justices during oral arguments last month. He predicted that if the landlord wins the case, people will infer their mail didn’t arrive “because of a rude comment that they heard, or what have you.”

The federal tort law allows a private individual to sue the federal government for monetary damages if a federal employee hurts them or damages their property by acting negligently.