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Discussion (61 Comments)Read Original on HackerNews
Yes - and this is actually really important! It's true of most of the important early internet technologies. It's the entire reason "internet" standards won over "telco" (in this case ITU) standards - the latter could only be deployed by big coordinated efforts, while internet standards let individual decentralized admins hook their sites together.
Did any of the ITU standards win? In the end, internet swallowed telephones and everything is now VOIP. I think the last of the X standards left is X509?
Anyone remember the promise of ATM networking in the 90's? It was telecom grade networking which used circuit switched networking that would handle voice, video and data down one pipe. Instead of carelessly flinging packets into the ether like an savage, you had a deterministic network of pipes. You called a computer as if it were a telephone (or maybe that was Datakit?) and ATM handed the user a byte stream like TCP. Imagine never needing an IP stack or setting traffic priority because the network already handles the QoS. Was it simple to deploy? No. Was it cheap? Nooohooohooohooo. Was Ethernet any of those? YES AND YES. ATM was superior but lost to the simpler and cheaper Ethernet which was pretty crappy in its early days (thinnet, thicknet, terminators, vampire taps, AUI, etc.) but good enough.
The funny part is this has the unintended consequences of needing to reinvent the wheel once you get to the point where you need telecom sized/like infrastructure. Ethernet had to adapt to deterministic real-time needs so various hacks and standards have been developed to paper over these deficiencies which is what TSN is - reinventing ATM's determinism. In addition we also now have OTN, yet another protocol to further paper over the various other protocols to mux everything down a big fat pipe to the other end which allows Ethernet (and IP/ATM/etc) to ride deterministically between data-centers.
Without being able to get too into the telco detail, I think the lesson was that hard realtime is both much harder to achieve and not actually needed. People will happily chat over nondeterministic Zoom and Discord.
It's both psychological and slightly paradoxical. Once you let go of saying "the system MUST GUARANTEE this property", you get a much cheaper, better, more versatile and higher bandwidth system that ends up meeting the property anyway.
Immutability is one of the best things about email.
that would be very annoying way to write e-mail and no less prone to typosquatting (if anything, more)
Both standards lacked hindsight we have today but x.400 would just be added complexity (as years of tacked-on extensions would build upon it) that makes non-error-prone parsing harder
SMTP handled routing by piggybacking on DNS. When an email arrives the SMTP server looks at the domain part of the address, does a query, and then attempts transfer it to the results of that query.
Very simple. And, it turns out, immensely scalable.
You don't need to maintain any routing information unless you're overriding DNS for some reason - perhaps an internal secure mail transfer method between companies that are close partners, or are in a merger process.
By contrast X.400 requires your mail infrastructure to have defined routes for other organisations. No route? No transfer.
I remember setting up X.400 connectors for both Lotus Notes/Domino and for Microsoft Exchange in the mid to late 90s, but I didn't do it very often - because SMTP took over incredibly quickly.
An X.400 infrastructure would gain new routes slowly and methodically. That was a barrier to expanding the use of email.
Often X.400 was just a temporary patch during a mail migration - you'd create an artificial split in the X.400 infrastructure between the two mail systems, with the old product on one side and the new target platform on the other. That would allow you to route mails within the same organisation whilst you were in the migration period. You got rid of that the very moment your last mailbox was moved, as it was often a fragile thing...
The only thing worse than X.400 for email was the "workgroup" level of mail servers like MS Mail/cc:Mail. If I recall correctly they could sometimes be set up so your email address was effectively a list of hops on the route. This was because there was no centralised infrastructure to speak of - every mail server was just its own little island. It might have connections to other mail servers, but there was no overarching directory or configuration infrastructure shared by all servers.
If that was the case then your email address would be "johnsmith @ hop1 @ hop2 @ hop3" on one mail server, but for someone on the mail server at hop1 your email address would be "johnsmith @ hop2 @ hop3", and so on. It was an absolute nightmare for big companies, and one of the many reasons that those products were killed off in favour of their bigger siblings.
Yes, it is a pain to manage. Yes, it is all still mostly running on 20+-year-old hardware and software.
It is slightly ironic that the main way we communicate X.400 addresses between parties is through modern email.
That would have required a lot of changes to computing history beyond simply email, and I doubt many of them would have been improvements.
Not even then, when people with access to computers were probably in the thousands, would anyone liked to type "C=no; ADMD=; PRMD=uninett; O=uninett; S=alvestrand; G=harald" just like in the example of the article.
Some examples from the article:
> You could have messaged an entire organization or department
This is a mailing list.
> So it was possible, say, for one implementation of X.400 to offer X.400 features like recalling a message, in theory at least, when such guarantees would fail as soon as messages left their walled garden. But “they couldn't buck the rules of physics,” Borenstein concluded. Once a message reached another server, the X.400 implementations could say that an email was recalled or permanently deleted, but there was no way to prove that it hadn’t been backed up surreptitiously.
This is a feature that (1) is in the spec, and also (2) is impossible to implement. That's not a real feature. It's a bug in the spec.
> You don’t email with X.400 today. That is, unless you work in aviation, where AMHS communications for sharing flight plans and more are still based on X.400 standards (which enables, among other things, prioritizing messages and sending them to the tower at an airport instead of a specific individual).
This is... also a mailing list. There's nothing difficult about having an email address for the tower. That email could go to one person, or many people. What's the difference supposed to be? What "feature" are we saying X.400 has that email didn't start with?
"A complex system that works is invariably found to have evolved from a simple system that worked."
https://lawsofsoftwareengineering.com/laws/galls-law/
In my naive youth I always thought top-down design was the sensible way to build systems. But after witnessing so many of them fail miserably, I now agree with Gall.
Thanks to email security scanners this feature is largely broken.
And so are single click to unsubscribe links. So much so that we have to put our unsubscribe page behind a captcha.
rant over
These are "scanner-proof" so far but support in clients like Outlook or Gmail is non-existent.
Which spammers and marketers would have loved.
I have "load remote content" disabled on my e-mail client so that tracking graphics/pixels do not leak such information to the sender.
One person's feature is another's anti-feature. I'm glad it's dead.
Did you mean "and is NOT triggered by email scanners"?
AFAIU, "email scanners" get more aggressive over time, so there is no once-and-forever solution. I guess AI-enabled email scanners can attempt to solve captchas as well.