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During the 1980s, I envisioned a (primitive) version of email that would come off telex machines. That is, a person would sit down at a keyboard, create a document, store it on a cartridge, stick the cartridge into say, a telex machine, send it to another terminal via modem, and the receiver could either print it out on his telex, or else download it to his screen, and read it off the screen. A similar result might have been obtained using fax machines. In either case, the "screen" would have represented a second delivery medium, as opposed to "just the fax" or "just the telex."

In actual fact, email became common in the mid-1990s when the Internet became commonly available. What is it about the internet that made it the driver of email? Put another way, why did it take so long for email to come into common use via the internet when it might have been made available through telex or fax machines perhaps 10-15 years earlier?

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Is a cartridge a physical object? if so, how is this different from a letter? How do you send it via modem? If a cartridge is not physical, why not just send the message? What is a telex machine? Is the answer simply that the UI for telex is far more complex than email? –  Mark C. Wallace Jul 1 at 14:56
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Can you elaborate on how that's functionally distinguishable from normal fax/telex usage? –  Semaphore Jul 1 at 15:13
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e-mail, in a form that's very similar to what we know today, has been around since the early 60's: en.wikipedia.org/wiki/Email#Origin. It didn't really "develop in tandem with the internet", the internet just made it accessible to a whole lot more people. –  Yannis Rizos Jul 1 at 15:22
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@TomAu I would argue that's because email, as we know it, isn't possible through fax machines (which were pretty cheap, you know). Faxing targets the physical line: you send it to a number, and the line it identifies number receives it. Email decouples the physical connection with the data link, such that you can receive the message no matter which physical entry point you use to access the network. –  Semaphore Jul 1 at 15:40
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@Semaphore: That's a key point, one that I had entirely overlooked. Why don't you put it in an answer? –  Tom Au Jul 1 at 15:42

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Emails was popularised on the internet because it is the medium that best enabled it.

The concept of emails actually predated the internet. It originated in 1960s computer networks, where users could login to a central server from multiple remote terminals - not altogether dissimilar from how users access the internet today. Emails as we know them developed as a means of passing messages between users under such an architecture.

This meant that fax/telex technologies were unsuited for delivering emails. Both fax and telex are point-to-point physical communication systems: faxing relies on the telephone network while telex had its own telegraphic network, but the principles are similar. When you send a fax, you target a physical line via a number. The machine on that specific, physical line then receives it.

In contrast, the email system found a natural habitat in the emerging internet. The beauty of the internet is that it decoupled the physical line from the data line. Like those internal messages on its predecessor networks, an email sent to you via the internet can be accessed from any internet connection. The internet does not care how you connect to it, whether by phone line or cable or satellite. As long as you have the correct credentials you can access the information.

So the answer is, emails came into common use with the internet because it is the first public global computer network. Fax/telex technologies may have been widespread years earlier but they were entirely unsuitable to handle email as we know it.

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Your basic premise is incorrect. Email did not develop in tandem with the Internet; the Internet simply made it available to the masses.

The use of "electronic mail" actually predates the Internet by a considerable margin. Electronic mail was used on ARPANET as far back as the 70's. The first standards were were proposed as early as 1973 (RFC 561). Throughout the 80's and beyond, email was widely used by folks who dialed into electronic bulletin board systems (BBSes) and other store-and-forward networks using phone lines and telnet connections. The email sent in the early 1970s looked quite similar to a basic text message sent on the Internet today, but the adoption of email simply grow in tandem with the use of electronic communications in general.

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Even before networks as we know them, a mainframe could contact others using UUCP (unix to unix copy) over a modem. The package could be passed on from this machine to others, world wide. E-mail messages could be sent over this medium too, all gathered up into one phone call every few hours or so. It wasn't instant like now, but it worked. –  Oldcat Jul 1 at 17:18
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The first para is just plain wrong. ARPANET was the forerunner of what we now call the internet, so Tom is correct in saying email developed in tandem with it. Then the second para confuses email with bulletin boards. –  andy256 Jul 1 at 22:39

In the 1980s most people did not have computers, except the college-educated upper middle class, and even then it was mostly knowledge workers, young people and gadget buffs who had them. Nobody had telex machines. Fax machines were only found in offices and there might be one fax machine for fifty people. I worked at one architectural firm, the type of place where a fax machine was critical, and they had one machine and over 100 employees.

In the 1980s, the main method of computer communication was via bulletin boards, called "BBSs" (bulletin board system). These did have "email" in the sense that you could leave messages for other people if they joined the same BBS, which was free and easy to do. Thus, there was email in the 1980s pretty readily available for anybody with a modem board in their computer, which was fairly common. All the computers we had growing up had modem boards.

Note that the modem uses the phone line when in use, so if anybody called the house while you were on the BBS, they got a busy signal. Also, if mom picks up the phone and hears the modem noise, you get yelled at, "GET OFF THE COMPUTER!"

The key advantage of the internet was to allow computers to connect through a second line and the universality of participants. In the 1980s you just had a few geeks using BBSs (though technically anybody could do it). The web, especially AOL, induced a lot of "average" people and companies to join the internet. This mass of people made email much more viable.

AOL, by the way, was kind of a transition between the 80s and the full internet. AOL was like a super-BBS with millions of users, so it was easy to message a large number of people on AOL by dialing up. Of course, once the internet became widely available dialing into AOL was redundant.

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"Also, if mom picks up the phone and hears the modem noise, you get yelled at, "GET OFF THE COMPUTER!"" Nostalgia +1 –  Yannis Rizos Jul 1 at 15:13
    
Brilliant answer. Maybe you'd like to take a crack at the other question I asked on user experience, the gist of which was why didn't phone companies create new lines for new applications? ux.stackexchange.com/questions/55765/… –  Tom Au Jul 1 at 15:16
    
Perhaps because monopolies don't innovate? –  Mark C. Wallace Jul 1 at 16:02
    
@TomAu In the 1980s switching techology was hard coded to the area code system. Different countries used different kinds of switches and numbering schemes, but it was important that all the switches in the same country work using the same scheme. So, to change the number of digits would have requiring replace tens of thousands of switches, printing new phone books and many other expenses. The phone company's attitude was that if you add a fax machine, add a normal line for the machine, and that was what people did. –  Tyler Durden Jul 1 at 16:09
    
The phone company also had the problem of supporting backwards compatibility - phones had to work with the oldest, crummiest switch in use until it could afford to upgrade their entire system, while the demand for phone numbers grew and grew. They couldn't afford for Tuscaloosa to be offline because of some trendy new device elsewhere. –  Oldcat Jul 1 at 17:29

How does it come about that one technology dominates?

There are many ways that one technology dominates.

  • Being "better" than competing approaches.
    Consider a house. When there was only the option of sleeping in a tree, on the ground, or in a cave, a primitive house offered many advantages. Today, a high proportion of the population live in houses, but other technologies are deemed "better" in many cases: units, apartments, and high-rise apartments.
    Consider bronze swords. Swords essentially developed from bronze daggers, and before that from stone knives. In comparison, bronze is less brittle than stone such as obsidian or flint, so a bronze dagger has an advantage (so say nothing of the associated prestige). A bronze sword provides more cutting "power" than a dagger, and allows one to outreach a dagger-armed opponent, so the sword has an advantage. But one does not replace the other - both have their uses (ie dominate) in particular circumstances. But then iron and later steel weapons dominated the bronze. Bronze can produce a very sharp edge, but in comparison to iron and steel, bronze is brittle. Iron was soft and soon steel came to dominate - not as sharp as bronze, but far less brittle; sharper and harder than iron.

  • Being the first.
    Being first can give a technology a huge advantage. Trains could be considered an example of this, if you accept a definition like "the first mass long distance transportation". People could and did travel across whole continents on foot, horseback, wagon or coach. But the advent of the train enabled mass, relatively fast travel at comparatively cheap prices. If you were near a railway station you had fast access to the rest of the world. It took two centuries for competing technologies, such as automobiles and aircraft, to be invented and then bridge the gap.

  • Through marketing, accident ...
    Not every "superior" technology dominates. The water is murkier here - did VHS dominate Betamax through superior technology, accidents of stubborn corporate decisions, or marketing?

In the case of email, it was a technology that was a good fit for the nascent internet: it was designed specifically for the purpose (see RFC821 and RFC822) and fulfilled a need. Before computers were permanently connected as they are today, email could be sent in hops from one machine to the next when they "dialed in" (often on a schedule). As connectivity has grown, so email has come into it's own.

The forerunner of the Internet, ARPANET, was managed by ARPA. ARPA determined how their network operated in a rather engineering-like way. A working group would be assembled, and would discuss and decide on what they thought was the best approach to a problem. The working group (WG) would then issue an RFC, which unless modified became the standard approach. The same process continues (see Wikipedia and The Internet).

So on the internet, there are no directly competing technologies. In a sense, email is the first, and the best at what it does.

The great advantage of email over telex or fax messaging is that email is "logically" addressed to a person, wherever they may physically be, and is (supposed to be) private to them. Whereas telex and fax messages are delivered to a physical location, and is not intrinsically private.

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