GN Netcom Inc. has filed an appeal in its high-profile antitrust suit against rival headset-maker Plantronics Inc., challenging a Delaware federal judge’s handling of spoliation that resulted in the destruction of thousands of emails potentially relevant to the case.

In a court filing on Monday, Denmark-based GN said it was appealing an order from U.S. District Judge Leonard P. Stark of the District of Delaware’s denying a new trial and additional sanctions, as well as “all other spoliation related” rulings in the case, which the company valued at $212 million. The appeal was filed with the U.S. Court of Appeals for the Third Circuit.