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Imagine hitting send on a simple email. Yeah, just a standard message and

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Instead of that satisfying digital whoosh you suddenly realize you have to build

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this massive heavily armed

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Constantly monitored digital fortress just to get that single message out the door.

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That sounds completely exhausting

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It really does but I mean for decades that was the harsh reality of running your

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own digital infrastructure

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Oh, absolutely. So today we are talking about taking back control of that

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infrastructure

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Yeah, and to do that we really need to recognize the supporter of this deep dive

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Which is safe server, right? Because taking back control is a big step exactly

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You know organizations constantly default to renting these incredibly expensive

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proprietary tools from mega vendors like Microsoft or Google

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Yeah, exactly for their daily communications mostly because building that fortress

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just seems too hard

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But safe server actually helps replace those massive systems with cost-effective

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open source solutions

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Which is so important today is especially when you're dealing with

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legal regulatory or compliance requirements things like strict email retention

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policies financial record audit trails or

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You know rigorous data protection data sovereignty becomes totally non-negotiable

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there, right?

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You need to know exactly where your data lives and frankly who holds the keys to it

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So safe server guides organizations through that entire process from the very

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beginning from the initial consulting phase

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Yeah to finding the exact right open source software fit right through to actually

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operating your systems on highly secure German servers

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You can explore all those possibilities at

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www.safeserver.de

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Well taking back that control usually starts with understanding the tools you're

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actually using

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I mean most of us interact with email every single day

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But we treat it like a total black box the underlying mechanics are just you know

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completely hidden from view

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Well, we are opening up the hood on that black box today. We're looking at a really

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fascinating piece of the Internet's invisible plumbing

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Oh, yeah, the Dima project exactly. We're diving into a github repository

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For a project called Dima which stands for the dragonfly mail agent and the

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documentation

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Really positions this software as a very beginner friendly entry point into open

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source infrastructure

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Which is rare in this space. It really is it's designed specifically for home and

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office use

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It basically strips away the massive walls of code that usually intimidate people

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when they hear words like, you know

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Mail server right because the first barrier to entry in this space is almost always

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the terminology. Oh for sure

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It's alphabet soup. Yeah, the documentation relies on this very specific sort of

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historical division of labor in email architecture

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It separates the whole process into MTAs and MUAs. Okay, so the source defines DMA

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as a small mail transport

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Agent or MTA and its designated job is to accept mail from a locally installed mail

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user agent

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That's the MUA right the MUA and then deliver it either locally or to a remote

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destination

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Let's let's try to ground that in the physical space for a second

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I think an analogy would definitely help here

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So think of the MUA as the person sitting at their desk, right?

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They're writing a letter putting it in an envelope and actually writing the address

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on the front

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So that's your outlook your Apple Mail your Thunderbird interface exactly and the MTA

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the mail transport agent is basically the mailroom down the hall

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It takes that sealed envelope from you figures out the logistics and literally

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loads it onto a truck to leave the building

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The mailroom analogy works conceptually, but I'd add one major caveat there

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What say this digital mailroom never sleeps it handles thousands of envelopes a

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second and the roads it drives on are basically

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Constantly collapsing. Oh meaning network outages precisely if we look at why this

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division of labor even exists

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It comes down to asynchronous processing. Okay unpack that a bit

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Well, if your desktop mail program your MUA had to handle the actual physical

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delivery of every single email across the global internet

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Your entire workflow would just grind to a halt because it's waiting on the other

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end, right?

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Imagine hitting send but the receiving server in Tokyo happens to be temporarily

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down or a router in the Midwest drops a packet

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You just that program would just freeze

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Exactly, you'd be staring at a spinning wheel

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Completely locked out of your inbox while the software repeatedly tries to

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establish a connection

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So the local software the MUA just hands the envelope to the mailroom and

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immediately walks away

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Yeah, the user gets to keep typing the next email while the MTA takes on the whole

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burden of waiting in line

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The MTA takes on the entire burden of network latency and failure states

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It cues the message it initiates all the complex digital handshakes with remote

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servers

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And if a connection fails it schedules a retry for 10 minutes later or maybe an

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hour later

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By focusing purely on that logistical transport side Dima acts as a highly

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specialized

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Incredibly lightweight courier right doesn't care about the font you used no not at

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all

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It strips out anything related to formatting text managing address books or

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organizing folders

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It handles routing and delivery full stop and that brings up a really fascinating

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limitation

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Detailed right there in the project's own github read me the disclaimer

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Yeah, they state explicitly that Dima is not intended as a replacement for

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Real big MTAs like send mail or postfix which is refreshing honesty

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It is and they highlight a very specific technical boundary

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Dina does not listen on port 25 for incoming connections, right?

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And just for context port 25 is the standard entry point for incoming email traffic

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across the global internet

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It's the front door exactly when a server wants to hand an email to another server

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It basically knocks on port 25, but wait if this software intentionally ignores

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incoming connections on the main email port

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It sounds like we're building half a bridge here. How do you mean?

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Well, a mail tool for a home or office seems fundamentally broken if it explicitly

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Refuses to receive mail from the outside world. Why would you want that?

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You really have to view this through the lens of modern internet security. The

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internet is exceptionally noisy

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I mean it is saturated with automated botnets

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Constantly scanning every single IP address in existence. Just looking for open

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doors, right?

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opening port 25 on a server is basically the equivalent of hanging a giant neon

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sign outside your house that says I

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Accept anonymous packages. Oh, wow. Yeah, there are IT veterans who still wake up

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in cold sweats. Remembering the early days of

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Server hosting, you know the open relay days. Yes, you'd accidentally leave port 25

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open

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Disconfigure one tiny setting and you'd come back from lunch to find your server

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had been completely hijacked by a botnet

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Just blasting out emails. Yeah, it just emailed half of Europe a massive spam

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campaign for prescription pills

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That is the exact nightmare scenario within minutes of opening port 25 automated

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scripts will probe your server looking for an open relay

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They just want to use your resources. Exactly. They want to exploit your hardware

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to blast out spam while masking their own identity

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Defending against that requires a heavily fortified infrastructure, which Dima is

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not no not at all to defend port 25

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You need complex configuration files real-time spam filtering IP reputation

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management constant monitoring all the heavy lifting

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Right. That is the job of a real big MTA like send mail or postfix

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They are designed to stand on the front lines and fight off those botnets

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So removing the doorbell entirely is the actual security strategy here exactly by

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not listening on port 25

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D may simply removes the attack sector

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It cannot be targeted by external spam or automated open relay attacks

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Because it literally just refuses to acknowledge anyone knocking from the outside

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It acts as a quiet outbound only workhorse for your local network, but who only

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needs outbound mail

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You'd be surprised a massive amount of infrastructure requires outbound email

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without ever needing to receive it like what think about it

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Your backup server needs to email you a success log at 2 a.m. Your internal web

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application needs to send a password reset link to a user

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Right or an alert exactly a temperature sensor and a server closet needs to fire

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off an emergency alert

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None of those systems ever need to receive replies that makes total sense

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So Dima takes the mail generated by those local machines and securely delivers it

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out to the world

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Completely bypassing the massive configuration overhead required to defend a public-facing

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inbox

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Okay, so knowing that it's an outbound only courier operating behind closed doors

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We need to look at the mechanism of how it actually hands that mail off to the rest

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of the world security and transit

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Right because the internet doesn't give you a free pass on modern encryption

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Just because your software footprint is small if you are transmitting passwords or

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sensitive server alerts

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The data must be secure in transit and balancing a tiny software footprint with the

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mathematical density of modern encryption is a massive

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Engineering challenge. Well, the repository files outlined exactly how Dima handles

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this the documentation specifically highlights TLS

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And SSL support along with SMTP authentication, which is standard modern security

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Yeah, and we can see the proof in the source code files

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You know names like crypto dot C base sixty four dot C and off dot conv

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But the language breakdown in the repositories of what really caught my eye here

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the C code

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Yeah, the project is overwhelmingly written in the C programming language

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Yeah, it sits at about eighty seven point five percent C with a total of four

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hundred and eighty seven commits

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That's the number of times developers have updated the code over its lifespan

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C is the foundational language of modern operating systems

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But it's powerful, but it places the entire burden of memory management on the

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human writing the code

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Okay, if you're listening to this and thinking why do I care about a decades-old

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coding language?

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hang with us for a second because this is where the vulnerability of

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Early software hits your daily life. It really does because C requires developers

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to manually allocate and free up computer memory, right?

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Yes, one microscopic Tyco like one forgotten line of code to clear a memory block

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and a malicious actor can overflow that memory

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To inject their own code completely compromising the server. It happens all the

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time in poorly written C

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So how does a small home and office tool safely manage complex modern encryption

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like TLS transport layer security?

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Using a language notorious for manual memory errors in just a handful of files

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The answer there really lies in the architecture of the code base and the principle

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of modularity modularity

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Yeah

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if you look at the file list you've got crypto dot C and base 64 dot C sitting

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right alongside net dot C for networking and

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Mail dot C for routing logic. Okay, so it's broken up

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Exactly and crucially Dema does not attempt to invent its own encryption algorithms

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from scratch, which would be a bad idea

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Oh writing custom cryptography and C is universally considered a terrible idea by

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security professionals. Leave it to the experts

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Yeah, right instead Dema's C code acts as a highly efficient bridge

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It interfaces directly with the existing battle tested security libraries already

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installed in your operating system like open SSL

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Ah, so it's like a small storefront that doesn't try to build its own bank vault

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out of plywood

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I like that analogy. It just builds a secure pneumatic tube that routes the

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transactions to the massive

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Impenetrable bank vault next door. That's exactly it. The code footprint stays

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Incredibly lean because it offloads all the heavy mathematical lifting to the

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system, which is smart

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It is and this leanness is actually its greatest security asset

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When you only have a handful of C files doing very specific tasks the code becomes

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auditable, right?

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You mentioned it has 487 commits

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Yeah, a dedicated developer could easily read through the entirety of Dimas code

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base over a weekend

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They can trace exactly how data flows from the local spool

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Which is essentially the digital outbox waiting area on your machine right out to

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the network. Where's a larger program?

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Oh auditing a legacy behemoth like sendmail with its labyrinth of configuration macros

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and literally thousands of source files

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That can take teams of experts months

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Yeah

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You can't hide a malicious backdoor or a glaring memory leak in a 10 page document

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as easily as you can bury it in a

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10,000 page manual the simplicity ensures that your home or office server can

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securely authenticate with remote destinations

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Proving who you are to Google or safe server or wherever you're routing the mail

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without bloating your local system with unnecessary code

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It is a textbook application of the UNIX philosophy

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Which is write small programs that do one thing do it exceptionally well and make

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sure they can talk to other programs

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Love that. Okay. So the code is

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lean and auditable

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But source code doesn't send emails running software does true and historically

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turning raw

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C-code into a running application was a brutal barrier to entry for anyone trying

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to self-host their own infrastructure

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Oh, it was a nightmare

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You have to download the raw text files ensure you had the correct compilers

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installed decipher complex

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prerequisite libraries just reading that hurts my brain and then you'd run the

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build process basically just praying it didn't terminate with a

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Cryptic error online 4000. Well the building section of the DMA readme actually

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still contains those old-school instructions

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Oh, it does. Yeah, it outlines the process of compiling, you know using a program

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to

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Translate human readable C code into the binary machine instructions your computer

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processor actually understands right the make commands

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Yeah for Linux it tells you to type make for BSD systems

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It's CD BSD and then make and then the installation. Oh man, then comes the

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installation command

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It's like make install it send mail link mail clink install spool deers install it.

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Etc. It's a lot

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It looks like an ancient incantation

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You are manually telling the computer where to put the executable files

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How to link them and exactly where to create the spool directories and the problem

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is

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One incorrect permission setting on just one of those directories and the entire

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mail agent fail silently

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Just dead in the water. Yeah, but and this is the best part the documentation

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highlights a massive shift

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In how we deploy this kind of software today. Thank goodness

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Yeah, you don't actually have to type any of those make commands anymore. I'll

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package managers

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Exactly. The project lists the exact simple commands used by modern package

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managers

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So on freebsd you open your terminal and type pkg install dima on ubuntu

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Which is arguably the most popular distribution for home servers

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It's just sudo apt install dima and arch linux arch users type yard digest dimar

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It's amazing a single command line execution basically replaces an hour of manual

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compiling and directory configuration

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The contrast is staggering for anyone who's intimidated by server administration

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I mean instead of reading a sprawling manual to compile source code you type three

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words hit enter and in about five seconds

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A fully functioning secure mail transport agent is actively running on your machine

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This is exactly where we see the invisible labor of the open source community at

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work. How so?

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Well the repository statistics you mentioned earlier hold the key to this ease of

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use

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All right, so it has 255 stars and 54 forks which indicates active interest and

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experimentation from other developers

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But more importantly it lists 34 direct contributors. Those 34 contributors are the

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bridge

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They're the bridge between the complex c code and that simple apt install command.

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They're the package maintainers exactly

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They took the original developer's code. They ran those complex make commands

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Figured out exactly which directories the files need to live in for uber 2

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Configured all the exact security permissions required and bundled it all into a

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neat downloadable package

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So they absorb the friction. Yes, they absorbed all the friction

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So the end user doesn't have to deal with it

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And honestly their labor is exactly why duma is prominently featured on the awesome

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self-hosted list. That's a great list

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It is for those who don't know that list is a highly curated directory of software

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Specifically chosen because it respects user privacy and allows individuals to

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reliably run their own digital lives

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And software does not make that list if it requires a computer science degree just

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to keep it running

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Definitely not being included means duma is trusted by a community that really

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prioritizes self-reliance and stability. It democratizes

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Infrastructure, you know, you no longer need a dedicated it department to handle

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your internal server routing

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The barrier to entry has essentially vanished and lowering that barrier

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Fundamentally changes the strategic calculation for organizations of all sizes.

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Absolutely if setting up specialized infrastructure is this accessible

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relying on

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bloated

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Proprietary ecosystems is no longer a mandatory cost of doing business

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Which you know really brings us back to the core mission of safe server, right?

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Because when the technical friction disappears, you can make decisions based on

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your actual needs rather than just technological lock-in exactly

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So a growing business a non-profit association or really any group managing their

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own data

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Might just need a lightweight tool like Dima to quietly handle internal server

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alerts where they might need something bigger, right?

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They might need a comprehensive open source alternative to replace their entire

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Expensive proprietary email suite across a hundred employees. Yeah, but in both

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scenarios, the cost-saving potential is immense

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You're not trapped. No, you do not have to pay per user per month licensing fees to

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tech conglomerates

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Just to route internal communications and more importantly you maintain total

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sovereignty over your data

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Which is critical but transitioning away from those massive vendors can still feel

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daunting

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Which is exactly why safe server can be commissioned for consulting

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They assess your specific operational needs and help you find and implement the

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right open source architecture

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Whether it's an intricate setup for a massive enterprise or just a simpler

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alternative for a small team

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Exactly. They ensure the solution fits and they can even host it on secure German

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servers

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You can explore those consulting and hosting options over at

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www.safeserver.de

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You know understanding the mechanics of a tool like daemma reveals a really

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important lesson. What's that? Enterprise grade reliability doesn't always require

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Enterprise grade bloat that is so true. We live in an ecosystem where technology

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companies are constantly pushing to add more

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every simple application on your phone suddenly demands to be an AI assistant a

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Social network and a data harvesting platform all simultaneously bloatware and

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feature creep have basically become the default state of the modern Internet

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They really have yet. Here is this tiny collection of C files net dot C

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Crypto dot C mail dot C that securely routes encrypted communications across the

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globe explicitly

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Refuses to do anything else and quietly gets out of your way the second its job is

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done. It's elegant

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It is so ask yourself

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Where else in your digital life might you benefit from replacing a bloated tracking

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heavy behemoth with a specialized simple tool?

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That just does its job and leaves you alone