1. an entrepreneur must have received the customer's electronic postal address in connection with the sale of a good or service (Section 7 (3) No. 1 UWG).
2. the entrepreneur uses the address for direct advertising for his own similar goods or services (Section 7 (3) No. 2 UWG).
3. the customer has not objected to the use for advertising purposes (Section 7 (3) No. 3 UWG).
4. the customer was clearly informed when the address was collected and at each use that he can object to the use at any time without incurring transmission costs other than those according to the basic rates (Section 7 (3) No. 4 UWG).
Violations may result in fines of up to €300,000.