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A letter is a written message conveyed from one person (or group of people) to another through a medium. Something epistolary means that it is a form of letter writing. The term usually excludes written material intended to be read in its original form by large numbers of people, such as newspapers and placards, although even these may include material in the form of an "
open letter An open letter is a Letter (message), letter that is intended to be read by a wide audience, or a letter intended for an individual, but that is nonetheless widely distributed intentionally. Open letters usually take the form of a letter (mess ...
". The typical form of a letter for many centuries, and the archetypal
concept A concept is an abstract idea that serves as a foundation for more concrete principles, thoughts, and beliefs. Concepts play an important role in all aspects of cognition. As such, concepts are studied within such disciplines as linguistics, ...
even today, is a sheet (or several sheets) of paper that is sent to a correspondent through a
postal system The mail or post is a system for physically transporting postcards, letters, and parcels. A postal service can be private or public, though many governments place restrictions on private systems. Since the mid-19th century, national postal sy ...
. A letter can be formal or informal, depending on its audience and purpose. Besides being a means of communication and a store of information, letter writing has played a role in the reproduction of writing as an art throughout history. Letters have been sent since antiquity and are mentioned in the ''
Iliad The ''Iliad'' (; , ; ) is one of two major Ancient Greek epic poems attributed to Homer. It is one of the oldest extant works of literature still widely read by modern audiences. As with the ''Odyssey'', the poem is divided into 24 books and ...
''. Historians
Herodotus Herodotus (; BC) was a Greek historian and geographer from the Greek city of Halicarnassus (now Bodrum, Turkey), under Persian control in the 5th century BC, and a later citizen of Thurii in modern Calabria, Italy. He wrote the '' Histori ...
and
Thucydides Thucydides ( ; ; BC) was an Classical Athens, Athenian historian and general. His ''History of the Peloponnesian War'' recounts Peloponnesian War, the fifth-century BC war between Sparta and Athens until the year 411 BC. Thucydides has been d ...
mention and use letters in their writings.


History of letter writing

Historically, letters have existed from
ancient India Anatomically modern humans first arrived on the Indian subcontinent between 73,000 and 55,000 years ago. The earliest known human remains in South Asia date to 30,000 years ago. Sedentism, Sedentariness began in South Asia around 7000 BCE; ...
,
ancient Egypt Ancient Egypt () was a cradle of civilization concentrated along the lower reaches of the Nile River in Northeast Africa. It emerged from prehistoric Egypt around 3150BC (according to conventional Egyptian chronology), when Upper and Lower E ...
and
Sumer Sumer () is the earliest known civilization, located in the historical region of southern Mesopotamia (now south-central Iraq), emerging during the Chalcolithic and Early Bronze Age, early Bronze Ages between the sixth and fifth millennium BC. ...
, through
Rome Rome (Italian language, Italian and , ) is the capital city and most populated (municipality) of Italy. It is also the administrative centre of the Lazio Regions of Italy, region and of the Metropolitan City of Rome. A special named with 2, ...
,
Greece Greece, officially the Hellenic Republic, is a country in Southeast Europe. Located on the southern tip of the Balkan peninsula, it shares land borders with Albania to the northwest, North Macedonia and Bulgaria to the north, and Turkey to th ...
and
China China, officially the People's Republic of China (PRC), is a country in East Asia. With population of China, a population exceeding 1.4 billion, it is the list of countries by population (United Nations), second-most populous country after ...
, up to the present day. During the 17th and 18th centuries, letters were used to self-educate. The main purposes of letters were to send information, news and greetings. For some, letters were a way to practice critical reading, self-expressive writing, polemical writing and also exchange ideas with like-minded others. For some people, letters were seen as a written performance. Letters make up several of the books of the Bible. Archives of correspondence, whether for personal, diplomatic, or business reasons, serve as
primary source In the study of history as an academic discipline, a primary source (also called an original source) is an Artifact (archaeology), artifact, document, diary, manuscript, autobiography, recording, or any other source of information that was cre ...
s for historians. At certain times, the writing of letters was thought to be an art form and a genre of literature, for instance in Byzantine
epistolography Epistolography, or the art of writing Letter (message), letters, is a genre of Byzantine literature similar to rhetoric that was popular with the intellectual elite of the Byzantine age."Epistolography" in ''Oxford Dictionary of Byzantium, The Oxfo ...
."Epistolography" in ''
The Oxford Dictionary of Byzantium The ''Oxford Dictionary of Byzantium'' (ODB) is a three-volume historical dictionary published by the English Oxford University Press. With more than 5,000 entries, it contains comprehensive information in English on topics relating to the Byzan ...
'',
Oxford University Press Oxford University Press (OUP) is the publishing house of the University of Oxford. It is the largest university press in the world. Its first book was printed in Oxford in 1478, with the Press officially granted the legal right to print books ...
, New York & Oxford, 1991, p. 718.
In the ancient world letters might be written on various different materials, including metal, lead, wax-coated wooden tablets, pottery fragments, animal skin, and papyrus. From
Ovid Publius Ovidius Naso (; 20 March 43 BC – AD 17/18), known in English as Ovid ( ), was a Augustan literature (ancient Rome), Roman poet who lived during the reign of Augustus. He was a younger contemporary of Virgil and Horace, with whom he i ...
, we learn that
Acontius In Greek mythology, Acontius (Ancient Greek: Ἀκόντιος) was a beautiful youth of the island of Ceos, the hero of a love story told by Callimachus in a poem of which only fragments remain, and which forms the subject of two of Ovid's ''He ...
used an apple for his letter to
Cydippe The name Cydippe (Ancient Greek: Κυδίππη ''Kudíppē'') is attributed to four individuals in Greek mythology. *Cydippe, one of the 50 Nereids, sea-nymph daughters of the 'Old Man of the Sea' Nereus and the Oceanids, Oceanid Doris (Oceanid) ...
. More recently, letters have mainly been written on paper: handwritten and more recently typed. There is a wealth of letters and instructional materials (for example, manuals, as in the medieval
ars dictaminis ''Ars dictaminis'' (or ''ars dictandi'') is the art of letter-writing, which often intersects with the art of rhetoric. History of letter-writing Greco-Roman theory Early examples of letter-writing theory can be found in C. Julius Victor's ...
) on letter writing throughout history. The study of letter writing usually involves both the study of
rhetoric Rhetoric is the art of persuasion. It is one of the three ancient arts of discourse ( trivium) along with grammar and logic/ dialectic. As an academic discipline within the humanities, rhetoric aims to study the techniques that speakers or w ...
and
grammar In linguistics, grammar is the set of rules for how a natural language is structured, as demonstrated by its speakers or writers. Grammar rules may concern the use of clauses, phrases, and words. The term may also refer to the study of such rul ...
. Historians of the medieval period often study family letter collections, which gather the personal and business correspondence of a group of related people and shed light on their daily life. The
Paston Letters The ''Paston Letters'' are a collection of correspondence between members of the Paston family of Norfolk gentry and others connected with them in England between the years 1422 and 1509. The collection also includes state papers and other impo ...
(1425 – 1520 CE) are widely studied for insight into life in Britain during the
Wars of the Roses The Wars of the Roses, known at the time and in following centuries as the Civil Wars, were a series of armed confrontations, machinations, battles and campaigns fought over control of the English throne from 1455 to 1487. The conflict was fo ...
. Other major medieval family letter collections include the Stonor Letters (1420 – 1483 CE),
Plumpton letters Plumpton may refer to: Places Places in Australia * Plumpton, New South Wales, suburb of Sydney * Plumpton, Victoria, suburb of Melbourne Places in England * Plumpton, Cumbria, village * Plumpton, Lancashire (''Great Plumpton'' and ''Little Plum ...
(1416 – 1552 CE), and
Cely Letters The Cely Letters are a collection of family correspondence written in the 15th century, which describe the lives and business activities of a family of London wool merchants. Key members were Richard Cely and his wife Agnes and their sons Robert, ...
(1472-1488 CE). In the United States, letters experienced a boost in popularity after the Postal Act of 1845 decreased the price of sending letters and when paper started being made with wood pulp. Letters were a chief form of communication, in both personal and business communications, for many centuries before
telegraphy Telegraphy is the long-distance transmission of messages where the sender uses symbolic codes, known to the recipient, rather than a physical exchange of an object bearing the message. Thus flag semaphore is a method of telegraphy, whereas pi ...
,
telephony Telephony ( ) is the field of technology involving the development, application, and deployment of telecommunications services for the purpose of electronic transmission of voice, fax, or data, between distant parties. The history of telephony is ...
, and Internet communications reduced their primacy. Even in times and places where literacy was lower, illiterate people could pay literate ones to write letters to, and to read letters from, distant correspondents. Even in the era of telegrams and telephones, letters remained quite important until
fax Fax (short for facsimile), sometimes called telecopying or telefax (short for telefacsimile), is the telephonic transmission of scanned printed material (both text and images), normally to a telephone number connected to a printer or other out ...
and
email Electronic mail (usually shortened to email; alternatively hyphenated e-mail) is a method of transmitting and receiving Digital media, digital messages using electronics, electronic devices over a computer network. It was conceived in the ...
further eroded their primacy, especially since the turn of the 21st century. As
communication technology Telecommunication, often used in its plural form or abbreviated as telecom, is the transmission of information over a distance using electronic means, typically through cables, radio waves, or other communication technologies. These means of ...
has developed in recent history, posted letters on paper have become less important as a routine form of communication. For example, the development of the
telegraph Telegraphy is the long-distance transmission of messages where the sender uses symbolic codes, known to the recipient, rather than a physical exchange of an object bearing the message. Thus flag semaphore is a method of telegraphy, whereas ...
drastically shortened the time taken to send a communication, by sending it between distant points as an electrical signal. At the telegraph office closest to the destination, the signal was converted back into writing on paper and delivered to the recipient. The next step was the
telex Telex is a telecommunication Telecommunication, often used in its plural form or abbreviated as telecom, is the transmission of information over a distance using electronic means, typically through cables, radio waves, or other communica ...
which avoided the need for local delivery. Then followed the fax (facsimile) machine: a letter could be transferred from the sender to the receiver through the telephone network as an image. These technologies did not displace physical letters as the primary route for communication; however today, the Internet, by means of email, plays the main role in written communications, together with text messages; however, these email communications are not generally referred to as letters but rather as e-mail (or email) messages, messages or simply emails or e-mails, with the term "letter" generally being reserved for communications on paper. On March 6, 2025,
PostNord PostNord AB is a provider of postal services operating mainly in the Nordic countries. The company was formed on 24 June 2009, under the name ''Posten Norden'', as the holding company in a Mergers and acquisitions, merger between the Danish and ...
announced that all letter mail deliveries will cease in
Denmark Denmark is a Nordic countries, Nordic country in Northern Europe. It is the metropole and most populous constituent of the Kingdom of Denmark,, . also known as the Danish Realm, a constitutionally unitary state that includes the Autonomous a ...
by the end of 2025, citing a 90% decline in letter mail since 2000.


Letters as historical source material

Due to the timelessness and universality of letter writing,
extant Extant or Least-concern species, least concern is the opposite of the word extinct. It may refer to: * Extant hereditary titles * Extant literature, surviving literature, such as ''Beowulf'', the oldest extant manuscript written in English * Exta ...
letters from earlier eras constitute an important category of
source material A source text is a text (sometimes oral) from which information or ideas are derived. In translation, a source text is the original text that is to be translated into another language. More generally, source material or symbolic sources are ob ...
in
historiography Historiography is the study of the methods used by historians in developing history as an academic discipline. By extension, the term ":wikt:historiography, historiography" is any body of historical work on a particular subject. The historiog ...
(the methodology of historians). Letters were often subject to state censorship and confiscation. Private letters preserved in state archives tell not only what the author intended but also how the letter's purported content was interpreted by state officials. In some cases, the confiscation of letters led to increased censorship, like bans on correspondence and migration.


Importance of letters in the 18th century

During the 18th century, called the "Great Age of Letter Writing", the
epistolary novel An epistolary novel () is a novel written as a series of letters between the fictional characters of a narrative. The term is often extended to cover novels that intersperse other kinds of fictional document with the letters, most commonly di ...
became a hugely popular genre and came from the format of letters. The novel also debuted in the 17th century with ''
Love-Letters Between a Nobleman and His Sister ''Love-Letters Between a Nobleman and His Sister'' is a three-volume roman à clef by Aphra Behn playing with events of the Monmouth Rebellion and exploring the genre of the epistolary novel. The first volume, published in 1684, lays some cla ...
''. Letter writers used this to communicate and explore their identity and daily life at the time. As a medium of writing that lies ambiguously between the public and private worlds, letters provide an appealing peek into other people's thoughts, feelings, and lives. During this historical period, publishing these "private" letters so they could build and preserve literary prominence became common for the first time. Just as social media streams now allow modern celebrities to present versions of their intimate lives for the public to see and read all about, so did early modern and 18th-century figures carefully build themselves in their letters for audiences to be excited to read these works of literature. In the 18th century, readers frequently associated personal letters with the ideals of honesty and truth. Writing in the 18th-century was a rough process that required a lot of materials, many of which were difficult or expensive to get. Researchers interested in the links and connections between migrants, settlers, and refugees have increasingly concentrated on letters and their purposes. Surprisingly, academics only began examining letters as artifacts in the late twentieth century; most studies continue to focus on the national course of epistolary novels. Letters also offer information on changing conceptions of privacy, secrecy, and trust during a period of widespread censorship, especially in war. Lastly, study on letter writing and mail services culture exposes the economic and technical roots of letter writing, as well as how links required resources ranging from writing tables and ink to postal employees and ships to carry letters over the world. A lot of letters that were written in this time also showed up in a popular magazine called ''
The Gentleman's Magazine ''The Gentleman's Magazine'' was a monthly magazine founded in London, England, by Edward Cave in January 1731. It ran uninterrupted for almost 200 years, until 1907, ceasing publication altogether in 1922. It was the first to use the term ''m ...
''. People were also charged for postage during this time. They either had to pay before or during transit. Writers took great caution in their number of pages so they did not have to pay so much. These writers were considered very clever in their way to avoid the overcharge. Letter writing also became a really important pastime for some. Women were among these people to write letters and express themselves. A lot of female friendships were formed from women being encouraged to write letters. In fact, the most popular character who wrote in this period was named Clarissa Harlowe. This was also a chance for women to express their intelligence. They used letters also to separate themselves from their husbands and have their own voice to enter more into society. Even when the epistolary novel lost its popularity, people did not stop writing letters. It gave everyone a voice when they did not think they had one and it is incredibly important to people to have that, especially the women of this time.
Alexander Pope Alexander Pope (21 May 1688 Old Style and New Style dates, O.S. – 30 May 1744) was an English poet, translator, and satirist of the Age of Enlightenment, Enlightenment era who is considered one of the most prominent English poets of the early ...
was the first English writer to publish from his own letters during his lifetime, putting out a new example for authors and other important people's epistolary works. Pope recognized that writings may reflect both personal religious devotion and cleverness. Pope's works are lacking in formality and informality. He had written his letters all about his life and what he did. Pope also wrote about his friends and the health and work of them. "All the pleasure of using familiar letters is to give us the assurance of a friend's welfare," Pope said. He had also taken to describing himself as "a mortal enemy and despiser of what they call fine letters." There was a letter addressed to Pope's father that ended up being used as writing paper for the ''
Iliad The ''Iliad'' (; , ; ) is one of two major Ancient Greek epic poems attributed to Homer. It is one of the oldest extant works of literature still widely read by modern audiences. As with the ''Odyssey'', the poem is divided into 24 books and ...
''. When Alexander Pope's letters were published, they were widely read by a number of people.


Comparison with electronic mail

Despite email's widespread use, letters are still popular, particularly in business and for official communications. At the same time, many "letters" are sent in electronic form. The following advantages of paper letters over e-mails and text messages are put forward: *No special device is needed to receive a letter, just a postal address, and the letter can be read immediately on receipt. *An e-mail may sit in a recipient's inbox for some time before being read, or may not be read at all; a paper letter is more likely to receive prompt attention once it arrives. *An advertising mailing can reach every address in a particular area. *A letter provides an immediate, and in principle permanent, physical record of communication, without the need for printing. Letters, especially those with a signature and/or on an organization's own notepaper, are more difficult to falsify than is an email, and thus provide much better evidence of the contents of the communication. *A letter in the sender's own handwriting is more personal than an e-mail and shows that the sender has taken the effort to write it. *If required, small physical objects can be enclosed in the envelope with the letter. *Letters are unable to transmit
malware Malware (a portmanteau of ''malicious software'')Tahir, R. (2018)A study on malware and malware detection techniques . ''International Journal of Education and Management Engineering'', ''8''(2), 20. is any software intentionally designed to caus ...
or other harmful files that can be transmitted by e-mail. *E-mails are insecure and may be intercepted en route. For this reason, letters are often preferred for confidential correspondence. *Letter writing leads to the mastery of the technique of good writing. *Letter writing can provide an extension of the face-to-face therapeutic encounter. *Since at least a small fee is required, sending a large number of irrelevant letters becomes more expensive (and therefore less likely) than e-mail (spam). The following advantages are put forward for e-mails and text messages over traditional letters: *They can be transmitted instantly. *They can be sent to a number of recipients in one operation. *They do not require a postage fee. *They do not require materials such as paper and ink. *Often an e-mail would require a less formal style than a letter to the same recipient, and thus may take less time to write. It is also easier to make amendments to a draft than it is with a handwritten letter. *E-mails may be composed using spell checkers and other devices, and thus may conceal the ignorance (inability to spell or compose prose etc.) of the sender. *During an epidemic, e-mails cannot transmit diseases. *Emails do not take up physical space and cannot be damaged in a natural disaster.


Delivery process

Here is how a letter gets from the sender to the recipient: # Sender composes and writes letter and may fold the letter so that it fits in an envelope. For bulk mailings, a
folding machine A folding machine is a machine used primarily for the folding of paper. Folding is the sharp-edged bending of paper webs or sheets under pressure at a prepared or unprepared bending point along a straight line according to specified dimensions and ...
may be employed. # Sender places the letter in an
envelope An envelope is a common packaging item, usually made of thin, flat material. It is designed to contain a flat object, such as a letter (message), letter or Greeting card, card. Traditional envelopes are made from sheets of paper cut to one o ...
on which the recipient's address is written on the front of the envelope, or often is visible through a transparent window of the envelope. Sender ensures that the recipient's address includes the ZIP or Postal Code (if applicable) and historically often included their return address on the envelope. # For small volume private letters, the sender buys a postage stamp and attaches it to the top right corner on the front of the envelope. (For most commercial letters, postage stamps are not used: a franking machine or other methods are used to pay for postage.) # Sender puts the letter in a postbox. # The national postal service of the sender's country (e.g.
Royal Mail Royal Mail Group Limited, trading as Royal Mail, is a British postal service and courier company. It is owned by International Distribution Services. It operates the brands Royal Mail (letters and parcels) and Parcelforce Worldwide (parcels) ...
, UK;
USPS The United States Postal Service (USPS), also known as the Post Office, U.S. Mail, or simply the Postal Service, is an independent agency of the executive branch of the United States federal government responsible for providing postal serv ...
, United States;
Australia Post Australia Post, formally the Australian Postal Corporation and also known as AusPost, is an Australian Government-State-owned enterprise, owned corporation that provides postal services throughout Australia. Australia Post's head office is loca ...
in Australia; or
Canada Post Canada Post Corporation (, trading as Canada Post (), is a Canadian Crown corporation that functions as the primary postal operator in Canada. Originally known as Royal Mail Canada (the operating name of the Post Office Department of the Can ...
in Canada) empties the postbox and transports all the contents to the local sorting office. # The sorting office then sorts each letter by address and postcode and sends the letters destined for a particular area to that area's local sorting office (sometimes called a delivery office). Letters addressed to a different region may go through more than one stage of transmission and sorting. # The local delivery personnel collect the letters from the delivery office and deliver them to the proper addresses. In some areas, recipients may need to collect the letters from the local office. This process, depending on how far the sender is from the recipient, can take anywhere from a day to 3–4 weeks. International mail is sent via
trains A train (from Old French , from Latin">-4; we might wonder whether there's a point at which it's appropriate to talk of the beginnings of French, that is, when it wa ... , from Latin , "to pull, to draw") is a series of connected vehicles th ...
and airplanes to other countries. In 2008, Janet Barrett in the UK received an
RSVP RSVP is an initialism derived from the French phrase ''"",'' meaning "please respond" (literally "respond if it pleases you"). It is typically used to request confirmation of an invitation. Occasionally, the phrase "please RSVP" is used, which ...
to a party invitation addressed to 'Percy Bateman', from 'Buffy', allegedly originally posted on 29 November 1919. It had taken 89 years to be delivered by the Royal Mail. However, Royal Mail denied this, saying that it would be impossible for a letter to have remained in their system for so long, as checks are carried out regularly. Instead, the letter dated 1919 may have "been a collector's item which was being sent in another envelope and somehow came free of the outer packaging".


Forms of letters

The forms (conformations) of letters have usually followed traditional norms of the times and places where correspondence took place. Aspects such as where to place the elements (
salutation A salutation is a greeting used in a Letter (message), letter or other communication. Salutations can be formal or informal. The most common form of salutation in an English letter includes the recipient's given name or title. For each style of ...
, body of letter,
valediction A valediction (Derivation (linguistics), derivation from Latin ''vale dicere'', "to say farewell"), parting phrase, or complimentary close in American English, is an expression used to say farewell, especially a word or phrase used to end a lett ...
/closing, sender's address, recipient's address, date, and so on) were somewhat standardized albeit also usually flexible in practice. The form often varied by kind of letter. For any kind, though, factors of cost—such as that each sheet/leaf of paper cost money to buy and to post, and the fact of who paid for the posting (sender or recipient)—placed constraints on the forms of letters that varied from negligible in some times and places to crucial in others. These factors of cost drove norms on whether to write on both sides of the leaf, whether to cross the leaf with lines written in both directions (horizontally and vertically), whether to allow margins and how big or small to make them, how much to abbreviate to save space, and whether to have a separate envelope and thus how to fold the letter and where on the leaf to put the addresses. Business encyclopedias and textbooks of the 19th and 20th centuries show that businesspeople of those eras sometimes took the standardization of the forms of business letters to extremes. Typists were required to follow dozens or hundreds of rules about element placement and sizing, some of them with rather arbitrary and even counterproductive (wastefully expensive) strictness. However, the effort to standardize (on where to put the information and how to represent it) did have various valid motivations, as in some respects it presaged the concept of
data normalization In mathematics and computer science, a canonical, normal, or standard form of a mathematical object is a standard way of presenting that object as a mathematical expression. Often, it is one which provides the simplest representation of an obje ...
, helping with the extensive manual indexing, cataloguing, and filing that characterized the
clerk A clerk is a white-collar worker who conducts record keeping as well as general office tasks, or a worker who performs similar sales-related tasks in a retail environment. The responsibilities of clerical workers commonly include Records managem ...
ing duties of the era. Over the centuries, a lexicon of abbreviations, metonymic short forms, and conventional valedictions developed for frequent use in letters. For example, "yours of the 12th inst." meant "your letter of the 12th of this month"; "do" meant " ditto"; and forms like "Yr Obdt Srvt" for "Your Obedient Servant" were common.


Kinds of letters

There are a number of different types of letter:


Security methods

Cryptography Cryptography, or cryptology (from "hidden, secret"; and ''graphein'', "to write", or ''-logy, -logia'', "study", respectively), is the practice and study of techniques for secure communication in the presence of Adversary (cryptography), ...
(secret writing) sometimes played a role in letters in centuries past, as correspondents would use previously agreed
code In communications and information processing, code is a system of rules to convert information—such as a letter, word, sound, image, or gesture—into another form, sometimes shortened or secret, for communication through a communicati ...
to try to shield the
plaintext In cryptography, plaintext usually means unencrypted information pending input into cryptographic algorithms, usually encryption algorithms. This usually refers to data that is transmitted or stored unencrypted. Overview With the advent of comp ...
from the comprehension of prying eyes during the letter's transit. This could be done in business letters to lessen spying by competitors on prices and methods and in personal letters to try to evade
postal censorship Postal censorship is the inspection or examination of mail, most often by governments. It can include opening, reading and total or selective obliteration of letters and their contents, as well as Cover (philately), covers, postcards, Parcel pos ...
(either of wartime censors or of peacetime authoritarian censors) or the gossip of townsfolk. It could be in either cryptic form (for example, "AEDFX GHSTR HTFXV") or in deceptively readable form (for example, "the dog will run at sunset unless the rains come"). By the standards of modern digital applied cryptography, the security was often not especially high (that is, the
codebreaking Cryptanalysis (from the Greek ''kryptós'', "hidden", and ''analýein'', "to analyze") refers to the process of analyzing information systems in order to understand hidden aspects of the systems. Cryptanalysis is used to breach cryptographic secu ...
was not necessarily difficult), but it was usually high enough to meet the demands of the context (that is, the degree of risk, the likelihood or stakes of any codebreaking efforts, and the state of the codebreaking art in each era). Various forms or precursors of
tamper-evident technology Tamper-evident describes a device or process that makes unauthorized access to the protected object easily detected. Seals, markings, or other techniques may be tamper indicating. Tampering Tampering involves the deliberate altering or adulterat ...
were developed over the centuries to enable the sending and receiving of letters whereby it would be evident to the recipient if anyone else had opened the letter before they received it. The principal class of these methods was
sealing wax Sealing wax is a wax material of a seal (emblem), seal which, after melting, hardens quickly (to paper, parchment, ribbons and wire, and other material), forming a bond that is difficult to break without noticeable tampering. Wax is used to verify ...
. Another method was to apply a small thin disc of
adhesive Adhesive, also known as glue, cement, mucilage, or paste, is any non-metallic substance applied to one or both surfaces of two separate items that binds them together and resists their separation. The use of adhesives offers certain advantage ...
material known as a wafer. A more elaborate class was
letterlocking Letterlocking is the act of folding and securing a written message (such as a letter) on papyrus, parchment, or paper, without requiring it to be contained in an envelope or packet. It is a traditional method of document security that utilizes ...
, including a type called spiral locking, which was especially relevant to government ministers, royal courts, judicial courts, and legislators.
Envelope An envelope is a common packaging item, usually made of thin, flat material. It is designed to contain a flat object, such as a letter (message), letter or Greeting card, card. Traditional envelopes are made from sheets of paper cut to one o ...
s are available in plain types as well as types with somewhat higher
privacy Privacy (, ) is the ability of an individual or group to seclude themselves or information about themselves, and thereby express themselves selectively. The domain of privacy partially overlaps with security, which can include the concepts of a ...
protection in which a pattern of ink is printed on the inner side, making it more difficult for anyone trying to
candle A candle is an ignitable candle wick, wick embedded in wax, or another flammable solid substance such as tallow, that provides light, and in some cases, a Aroma compound, fragrance. A candle can also provide heat or a method of keeping time. ...
a sealed letter (that is, examine it translucently via
backlight A backlight is a form of illumination used in liquid-crystal displays (LCDs) that provides light from the back or side of a display panel. LCDs do not produce light on their own, so they require illumination—either from available light, ambie ...
). Such envelopes are usually called privacy envelopes or security envelopes. Another
sense A sense is a biological system used by an organism for sensation, the process of gathering information about the surroundings through the detection of Stimulus (physiology), stimuli. Although, in some cultures, five human senses were traditio ...
of the term ''security envelope'' refers to security bags. Diplomatic mail pouch systems are special, small, closed postal systems run by each country's
ministry of foreign affairs In many countries, the ministry of foreign affairs (abbreviated as MFA or MOFA) is the highest government department exclusively or primarily responsible for the state's foreign policy and relations, diplomacy, bilateral, and multilateral r ...
or department of state. A general theme of the diplomatic mail pouch is that outsiders never have physical access to it during the entire chain of custody; it never gets sent off out of sight of authorized persons, which would otherwise be the weak link in the chain where
intelligence agencies An intelligence agency is a government agency responsible for the collection, analysis, and exploitation of information in support of law enforcement, national security, military, public safety, and foreign policy objectives. Means of inf ...
could surreptitiously examine it in non-evident ways. The mail pouch itself in a diplomatic mail pouch system is often a security bag instead of merely any cloth pouch or sack.


Gallery

File:Brev från Mikael Agricola till Nils Bielke 1549.jpg, A hand-written letter (written in Swedish) from
Mikael Agricola Mikael Agricola (; c. 1510 – 9 April 1557) was a Finnish Lutheran clergyman who became the de facto founder of literary Finnish and a prominent proponent of the Protestant Reformation in Sweden, including Finland, which was a Swedish territo ...
to Nils Turesson Bielke, 1549. File:From Caroline Weston to Deborah Weston; Tuesday, June 1, 1841? p1.jpg, By writing both across and down, the sender of a letter could save on postage. File:Cesare Borgia, handwritten letter 1.jpg, A hand-written letter of
Cesare Borgia Cesare Borgia (13 September 1475 – 12 March 1507) was a Cardinal (Catholic Church)#Cardinal_deacons, cardinal deacon and later an Italians, Italian ''condottieri, condottiero''. He was the illegitimate son of Pope Alexander VI of the Aragonese ...
. File:Virginia Santa Claus.png,
Virginia O'Hanlon Laura Virginia O'Hanlon Douglas (July 20, 1889May 13, 1971) was an American educator best known for writing a letter as a child to the New York newspaper ''The Sun'' that inspired the 1897 editorial " Is There a Santa Claus?". The editorial, by ...
's original 1897 letter which was answered by Francis Pharcellus Church in his famous newspaper editorial " Yes Virginia, there is a Santa Claus" File:Wish list.jpg, A child's letter to
Santa Claus Santa Claus (also known as Saint Nicholas, Saint Nick, Father Christmas, Kris Kringle or Santa) is a legendary figure originating in Western Christian culture who is said to bring gifts during the late evening and overnight hours on Chris ...
. File:Letter from Arthur Conan Doyle to Herbert Greenhough Smith.jpg, A letter from
Arthur Conan Doyle Sir Arthur Ignatius Conan Doyle (22 May 1859 – 7 July 1930) was a British writer and physician. He created the character Sherlock Holmes in 1887 for ''A Study in Scarlet'', the first of four novels and fifty-six short stories about Hol ...
about his 1902 novel ''
The Hound of the Baskervilles ''The Hound of the Baskervilles'' is the third of the four Detective fiction, crime novels by British writer Arthur Conan Doyle featuring the detective Sherlock Holmes. Originally serial (literature), serialised in ''The Strand Magazine'' from ...
''. File:Invitation to Space Needle groundbreaking, 1961.jpg, An invitation letter to the ground-breaking of the Seattle
Space Needle The Space Needle is an observation tower in Seattle, Washington, United States. Considered to be an icon of the city, it has been designated a List of Seattle landmarks, Seattle landmark. Located in the Lower Queen Anne, Seattle, Lower Queen An ...
, 1961. File:Letter of Resignation of Richard M. Nixon, 1974.jpg, The resignation letter of U.S. president
Richard Nixon Richard Milhous Nixon (January 9, 1913April 22, 1994) was the 37th president of the United States, serving from 1969 until Resignation of Richard Nixon, his resignation in 1974. A member of the Republican Party (United States), Republican ...
, 1974. File:Augusto Tominz - The Letter, 1873.jpg, A
letter sheet In Philately, philatelic terminology a letter sheet, often written lettersheet, is a sheet of paper that can be folded, usually sealed (most often with sealing wax in the 18th and 19th centuries), and mailed without the use of an envelope, or i ...
. - ''The Letter'', 1873


See also


References


External links

* * *
Letters as historical sources.

The First English Family Letters
at ''
History Today ''History Today'' is a history magazine. Published monthly in London since January 1951, it presents authoritative history to as wide a public as possible. The magazine covers all periods and geographical regions and publishes articles of tradit ...
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