Dead letter office

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Dead letter office, probably in Washington, D.C.; September 1922

A dead letter office (DLO) is a facility within a postal system where undeliverable mail is processed.[1] Mail is considered to be undeliverable when the address is invalid so it cannot be delivered to addressee, and there is no return address so it cannot be returned to the sender.

At a DLO, mail is usually opened to try to find an address to forward to. If an address is found, the envelope is usually sealed using tape or postal seals, or enclosed in plastic bags and delivered.[2] If the letter or parcel is still undeliverable, valuable items are then auctioned off while the correspondence is usually destroyed. Despite this practice, in the past some undeliverable envelopes were acquired by philatelists.[3]

Dead letter offices go by different names in different countries. Other names include returned letter office or undeliverable mail office.

By country[edit]


Canada Post sends mail which is not deliverable to the Undeliverable Mail Office (NUMO) at Mississauga, Ontario,[4] or North Sydney, Nova Scotia. Domestic mail which is still undeliverable after passing through NUMO is then destroyed, while incoming international undeliverable mail is returned to the country of origin.[3]


In Malta, undeliverable mail was sorted in the General Post Office in Valletta. The facility was initially known as Returned Letter Branch, but later on it was also referred to as Returned Letter Office or Dead Letter Office. Various postal markings were used at the facility from 1889 onwards.[5]

United Kingdom[edit]

A Dead Letter Office was first established in 1784 for dead and missent letters that had reached London. The bye-letter offices dealt with bye-letters and those that did not go to London. No postage was charged for returns, which were made after six months, where an addressee was found. From 1790 a charge was made for returned letter but the time was reduced to two months by John Palmer. Upon hearing of the return charge William Pitt rescinded the charge.[6]

In the UK, undeliverable mail is processed in the National Returns Centre in Belfast[7] which holds 20 million undeliverable items,[8] or in a smaller office in Portsmouth.[9]

United States[edit]

The U.S. Post Office, as it was known then, started a dead letter office in 1825 to deal with undeliverable mail. By 1893, it handled about 20,000 items every day.[3] In 2006 approximately 90 million undeliverable-as-addressed (UAA) items ended up in the dead-letter office of the U.S. Postal Service; when the rightful owners cannot be identified, the correspondence is destroyed to protect customer privacy, and enclosed items of value are removed.[10] Items of value that cannot be returned are sold at auction, except for pornography and firearms. The auctions also occasionally include items seized by postal inspectors and property being retired from postal service.[citation needed]

These facilities are now known as mail recovery centers (MRC). Other former names include dead letter branch and dead parcel branch. The USPS mail recovery center is located in Atlanta, Georgia. Since April 2013, the postal auctions have been held online and include not only material lost in the U.S. but also material from other national postal authorities who consign them to the USPS for auction.[11]

In popular culture[edit]


  1. ^ Patrick, Douglas & Mary (1973). The Musson Stamp Dictionary. Toronto: Musson Book Company. p. 64. ISBN 0773700064.
  2. ^ Hirn, Todd A. "Officially Sealed Mails of the World". Retrieved 21 March 2015.
  3. ^ a b c Miller, Rick. "Dead letter office gave rise to official seals". Retrieved 21 March 2015.
  4. ^ Lu, Vanessa (29 September 2011). "Ever lose anything in the mail? Here's where it all ends up". Toronto Star. Retrieved 28 August 2012.
  5. ^ Proud, Edward B. (1999). The Postal History of Malta. Heathfield: Proud-Bailey Co. Ltd. p. 250. ISBN 1872465315.
  6. ^ Joyce, Herbert (1893). The History of the Post Office from its establishment down to 1836. London: Richard Bentley & Sons. pp. 307–308.
  7. ^ "What happens next when we can't deliver your mail". Royal Mail. 2015. Retrieved 22 March 2015.
  8. ^ Mayll, Steve (13 February 2013). "The lost post: Secrets of the warehouse where 20 MILLION undelivered items have ended up". UK News. Daily Mirror. Retrieved 22 March 2015.
  9. ^ Mann, Natasha (27 January 2003). "People send the funniest things". The Guardian. Retrieved 21 March 2015.
  10. ^ "2006 Comprehensive Statement". USPS. 2006. Archived from the original on 9 May 2009. Retrieved 25 March 2009.
  11. ^ Malloy, Daniel (7 March 2013). "Post Office moving Atlanta unclaimed mail auction online". Atlanta Journal-Constitution. Retrieved 30 December 2013.
  12. ^ Carr, Kevin (16 December 2013). "Could the U.S. Post Office Really Help Prove Santa Exists, Like in 'Miracle on 34th Street'?". Film School Rejects. Retrieved 21 May 2014.
  13. ^ "The Complete Clive Barker's The Great and Secret Show". Literal Remains. 8 September 2010. Archived from the original on 21 May 2014. Retrieved 21 May 2014.
  14. ^ "Script - Sunday, Cruddy Sunday". Retrieved 17 July 2014.
  15. ^ Maslin, Janet (1 November 1996). "Movie Review: Dear God (1996) Where Do Dead Letters Go? Heaven". New York Times. Retrieved 21 May 2014.
  16. ^ "Martha Williamson Begins a Highly Anticipated Return to Television with "Dead Letters," (Working Title) a Hallmark Channel Original Movie of the Week and Potential New Primetime Series". The Futon Critic. July 2, 2013. Retrieved April 14, 2014.
  17. ^ "The Male in the Mail". 1 December 2011. Retrieved 12 June 2014.
  18. ^ Melville, Herman (1990). Bartleby and Benito Cereno. New York: Dover Thrift Editions. p. 34. ISBN 9780486264738.

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