The Danish Postal incumbent’s, Post Danmark, struggle to acclimatize to a market without special rights has yielded epic competition cases such as Post Danmark I and Post Danmark II. While it is tempting to label Post Danmark as a serial infringer, it is fundamentally a company that was slow in accepting that letter mail presented a dying business case and viewed other services as being merely and capable of being priced accordingly. The extreme fall in letter volumes has made this position untenable, explaining the company’s financial collapse and persistent clashes with competition law. Studies of Post Danmark’s ‘troublesome’ relationship with competition law offer insights into the treatment of multi-product companies under competition law the need to police their allocation of costs and the consequences of failing in this.