this post was submitted on 19 Apr 2024
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I wish people used email for chat more. SMTP is actually a pretty great protocol for real time communication. People think of it as this old slow protocol, but that’s mostly because the big email providers make it slow. Gmail, by default, waits ten seconds before it even tries to send your message to the recipient’s server. And even then, most of them do a ridiculous amount of processing on your messages that it usually takes several seconds from the time it receives a message to the time it shows up in your account.
There’s a project called Delta Chat that makes email look and act like a chat app. If you have a competent email service, I think it’s better than texting. It doesn’t stomp on the images you send like SMS and Facebook do, everyone has it unlike all the proprietary services, and you can run your own server for it that interacts with everyone else’s servers.
Unfortunately, Google, Microsoft, etc all block you if you try to run your own server “to protect against spam”. Really, I’m convinced that’s just anticompetitive behavior. The fewer players are allowed to enter the email market, the less competition Gmail and Outlook will have.
As much as I like ProtonMail too, unfortunately their encryption models prevents it from working with Delta Chat. I’d love to see Proton make a compatible chat app that works with their service.
I made an email service called Port87 that I’m working on making compatible with Delta chat too. I’d love to see people using email the way it was originally meant to be used, to talk to each other, without being controlled by big businesses.
SMTP is a terrible protocol. Text based for sending effectively binary data with complex header wrapping and "generate a random delimiter" framing. We really need a HTTP/2 of SMTP.
That being said I agree that it exists and works. The biggest blocker to more IM-style communication is largely the UI and user expectations. I have no problem having quick back-and-forths over email but most people don't expect it.
Fair enough. Sending binary data over SMTP adds a lot of overhead, because it all has to be encoded. We should fix that.
Honestly my biggest complaint is header wrapping. Technically you need to wrap lines at 998 bytes (not that any reasonable server actually cares). But in order to wrap a header you need to add spaces (because you can only break a line after whitespace). But where spaces are unimportant depends on each specific header. So you need to have custom wrapping rules for each header.
In practice no one does this. They just hope that headers naturally have spaces or break them in random locations (corrupting them) because the protocol was too stupid.
Binary protocols are just so much simpler. Give the length, then the data. Problem solved. Maybe we could even use a standard format for structured headers. But that would be harder to do while maintaining backwards compatibility.