By default, procmail will "bounce" undeliverable mail back to the sender. Other names include returned letter office or undeliverable mail office. As of August, 2019, mail sent to the address was being returned as "undeliverable". It will compile a list of voters for whom mail has been returned as undeliverable. At some post offices, mail received that is undeliverable is recycled. Mail from the court to Turner was returned as "Undeliverable". Because a misspelling usually results in an undeliverable address, commonly misspelled words are corrected. In 2015, one company estimated undeliverable mail cost the US economy $65 billion a year. In Malta, undeliverable mail was sorted in the General Post Office in Valletta. Despite this practice, in the past some undeliverable envelopes were acquired by philatelists. His attempts to write to Elena are fruitless; his letters are returned as undeliverable. Until recently, it was considered an undeliverable medium that could not be controlled.