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Netflix has also raised concerns about the proposed change. The company warned investors in a Securities and Exchange Commission filing that increased postal rates could hurt profits.

“If the U.S. Postal Service were to change any policies relative to the requirements of first-class mail, including changes in size, weight or machinability qualifications of our DVD envelopes, such changes could result in increased shipping costs or higher breakage for our DVDs, and our contribution margin could be adversely affected,” company officials wrote in a SEC filing in early 2013.