Zix wants to nix the idea of unsavory characters reading your e-mail. The company offers secure e-mail encryption and transmission services. Its technology enables users to transmit encrypted e-mail and documents to any address in the world; recipients who are not service subscribers can access the messages through the company's Web-based portal. Zix targets customers in the health care, financial services, insurance, and government sectors. The company discontinued its electronic prescribing service, which allowed physicians to use a handheld device to prescribe drugs and transmit prescriptions electronically.