I have been using KDE for a while, while I like many features I am looking for suggestions to the default email client:

Kmail - completely unusable for me and the only one which could maybe be integrated with kontacts, it could not receive mails from IMAP or pop or would receive only sometimes

Geary - good but too minimal, I need at least some kind of contact list and mailing lists feature, maybe this integrates with gnome contacts? I couldn't find anything in settings

Let's say I want to build a GPS module for my car, which is only a GPS, doesn't hold anything else. Or a recipe tablet for my kitchen which only hold a recipe app.

Is this kind of purposes common? What would be the best way to do this kind of stuff? How do I choose the hardware? How do I "lockdown" certain aspects I don't need about software?

These kind of devices could be convenient because, by only holding what's needed, they would use less resources, they would be completely distraction free and they would be suitable to be used by non tech savy user which would need to use only one or two programs without messing with the system in any way.

I know KDE ha some kind of multi app kiosk settings, GNOME also can achieve something similar tho it's more confusing.. There are some kiosk distros which only give you a browser. But I don't see anything that can be set up, customized, and locked like that.

But would that be the best way of achieving something like that? I mean to use a GPS I don't need a terminal, nor video codecs, nor a browser.. Maybe I can add the possibility to send Osmand google maps links.. Or I can decide to make it hold Spotify too to make it a radio as well.. But a full distro would be wasted!

But how do I prevent every other use except the intended ones? Is there an easy way to achieve a "one purpose device" using Linux? Should I simply use whichever distro I like and uninstall everything which is not needed (I see use case for arch)?

I feel like we have the total freedom of Linux distros on one side, and companies using managed devices on the other by setting complicated policies, but I don't know any options in between!

Maybe the focus here is the desktop environment more than distros! Are there desktop environment purposed to give the user a set of limited apps, or a single app (which isn't only a browser)?

Is there a way to require a user to wait a certain time instead of asking for a password every time he wants to execute a command as root or access the root / or another user account?

I remember the old great times of barinsta.. Is there any app now? Or at least website.. ...That works decently?

I like notion a lot, especially for its databases function, it's much more powerful than stuff like excel, but being proprietary I'm scared of the buyers lock in / notion disallowing exports in the future and all the cons that come from using a proprietary software. Also managing integrations is probably harder than with an app that you own I think..

Is database in notion just a normal database like mysql? How easy/intuitive would be making the switch? Is it worth it?

We would use it for a very small organization, mostly for registering invoices, documents, lists of contacts with several informations.

I need to query results and to sort / filter database as I want, there's also the idea of trying integrating it with a website in the future maybe..

I like how practical notion is, but I don't like that it's proprietary and notion could potentially modify its terms of use whenever it wants.

After the last updates the apps started lagging lagging like hell, is there any frontend app? (Preferably Foss)

I've seen there's an app on FDroid but it does not really work anymore, are there alternative ways?

(Interested for mobile/Android mostly)

Let's say I have to host 25 websites.. How do I know how powerful should my VPS be? Which specs it should have, how fast the connection should be to handle X visits per day?

How do you understand which are your system requirements BEFORE deploying a project? Do you just make estimates and then scale up? Or there's some kind of tool to benchmark? how to handle this kind of stuff?

I like the concept of sandboxing, of device manager and restricted user, in certain cases it can be really useful to implement, and I'd like to try doing something like that on desktop.

I would install Android directly but desktop apps are usually superior in many ways.

At the same time I think stuff like qubes OS is too much..

Maybe leveraging flatpaks or docker can be a solution, toolboxes too?

I've also tried Nixos but I don't think it is what I'm looking for.

Hi! I'm trying to achieve this configuration: essentially all the traffic in the network should pass the content filtering in the proxy, assume I have control over the clients. All not proxied traffic should be blocked by default.

I know not all network traffic can pass through proxy, but I'm not sure I understand how actually all of this work.

My UFW firewall configuration is the following:

To                         Action      From
--                         ------      ----
3128                       ALLOW OUT   Anywhere                  
53                         ALLOW OUT   Anywhere        

53 is for DNS requests (that cannot pass through the proxy), even if I use DOH this port needs to be open for bootstrapping.

3128 is Squid proxy port.

I'm assuming the following:

client -> dns request (53) / cannot be handled by the proxy -> dns response client -> proxy (all ports that the proxy can handle) -> http/https/ftp response client -> blocked (all other ports)

But from UFW logs it looks like the client is trying to make requests (eg. https requests) directly through port 443, instead that passing from 3128.. Maybe I'm getting something wrong here on how Proxies work.

Do you have any suggestion?