PostNL has reported a disappointing financial year in 2024, primarily attributed to a lower-than-expected volume of Christmas cards sent. Concerns regarding the company are escalating as it announced an unexpected significant decline in profits for the year. In response to these challenges, PostNL has once again revised its profit forecast for 2024, citing an 'unsustainable' business model. The company's struggles reflect broader issues in the market, which are compounded by changing consumer behaviors.