Five major U.S. postal carriers are urging their customers to reconsider sending their postcards, citing an increasingly competitive market and increasing concerns about counterfeiting.

The companies’ proposed rules would prohibit people from sending postcards in packages larger than 10 pounds (4.8 kilograms), including personalized mailings and business cards.

They also would require mailers to keep their packages on display for up to two weeks at least, and require all cards to be signed by the recipient.

The Postal Service says the rule would save money by reducing packaging and mailing costs.

But the proposed rule would not affect personal and business postcards sent to the same address, such as a birthday party.

The companies also argue that most Americans are unlikely to be caught by counterfeiters.

“While we cannot predict every situation that might arise, our experience suggests that postcards are often of low value to counterfeiters, and that postcard fraud is more likely to occur when the card is marked with a special symbol, such a ‘postmark,'” the proposed rules say.

“The symbol may also be used to indicate a unique product or service.”

Postcard companies have been lobbying the federal government for years to restrict their businesses’ business, with many arguing the current rules are too onerous and will force them to raise prices or lay off employees.

Some of the largest companies in the United States, including FedEx, UPS and USPS, have also lobbied the White House to loosen restrictions on their products, but so far, they have failed to sway the president.

The USPS, which has a market share of more than 40% in the U..

S., has long been a favorite target for criminals.

But the postcard industry has struggled to respond to the rise in counterfeit cards and postcards.

The USPS has faced lawsuits alleging it had a poor track record at detecting and stopping mail fraud.

In 2016, the U,S.

Department of Justice filed a lawsuit alleging that USPS mislabeled more than 10 million cards in mailings.

The lawsuit also alleged that the USPS did not provide adequate training to employees and failed to address concerns that some cards were forged.

The companies have said they plan to meet with the U in the coming weeks.