Any Washington state residents who received a commercial email from Costco between 2021 and 2026 could be eligible to file a claim. In a lawsuit, Costco was accused of distributing commercial emails containing deceptive subject lines promoting sales or promotions. What was the Costco email lawsuit about? Washington’s Commercial Email Electronic Mail Act (CEMA) regulates commercial email marketing and the act; recipients can recoup up to $500 per qualifying email. To receive a share of the settlement, eligible class members must submit a claim form by Aug. 24, 2026.