Cybersecurity systems used by the U.S. Postal Service aren’t yet available to most customers, Postmaster General Patrick R. Donahoe told reporters Tuesday at the National Press Club in a farewell address as the top man in the post office.

“The Postal Service is already using a lot of cyber protection not on the market yet,” Donahoe said. He is retiring at the end of January, having served since Dec. 6, 2010, as the 73rd postmaster general.