LinHES, formerly known as KnoppMyth, is a rather specialised Linux distribution, and that matters a great deal when choosing an email client. It is not a mainstream desktop-first system in the way Ubuntu, Fedora, or Linux Mint are. LinHES is built around home theatre and media-centre use, with MythTV at its core, and it is usually deployed on hardware where the priority is reliability, low fuss, and a clean living-room-friendly interface rather than a full office workstation experience.

That immediately narrows the field. On LinHES, the most sensible choices are clients that either fit cleanly into lightweight desktop environments, work well in a “set it and forget it” setup, or are easy to install without forcing the user into awkward dependency chains. LinHES also inherits a Debian-style package management approach in most practical deployments, so deb packages are the most relevant from the list you gave. In day-to-day terms, that makes clients such as Thunderbird, Betterbird, Evolution, and KMail / Kontact the most realistic candidates. I’ll also include Proton Mail and Tuta Mail, because they are worth considering if you rely on those services and the packages are compatible with the distro’s environment.

For LinHES specifically, I would avoid recommending anything overly niche unless you already know you want it. A TUI client like aerc or NeoMutt is excellent on a server or a very keyboard-driven workstation, but LinHES is not really that kind of machine. Likewise, Mailspring is polished, but it is less attractive here because the distro’s practical install path is more likely to be stable with Debian packages or well-supported flatpaks than snap-based workflows, and because LinHES users generally want fewer background services and less packaging friction.

Below is a practical comparison of the clients that make the most sense for LinHES. I’ve kept it focused on the ones that are actually worth discussing for this distro, rather than listing every option for the sake of it.

For LinHES, the key technical point is that the system is not primarily designed to be a broad software-development or office desktop. It tends to be used by people who want a stable MythTV experience, often with modest hardware or with a machine that is also doing media playback duties. That means the best email client is one that won’t complicate the system, won’t demand special integration, and won’t fight the desktop environment. In practice, that pushes Thunderbird to the top, Evolution into second place for people who need calendar and address-book integration, and KMail if the machine is using KDE Plasma or you simply prefer the KDE stack.

Thunderbird is the best fit for most LinHES installations. It is mature, familiar, and not tied to a particular desktop shell. If LinHES is running Xfce, a lightweight window manager, or even a fairly plain desktop session, Thunderbird remains comfortable and predictable. It handles IMAP exceptionally well, which is important if the machine is used intermittently and mail is kept on the server. Its add-on ecosystem is still one of its biggest advantages, and it has a sensible account wizard for users who want to get on with the job rather than spend half an hour entering server settings by hand.

Evolution is the right answer for a different kind of user: someone on LinHES who also wants calendar syncing, contacts, and perhaps Exchange-style business connectivity. If your LinHES box happens to be used as a general-purpose workstation as well as a media machine, Evolution becomes more attractive. That said, it is more at home in GNOME than in a media-centre build. It is a heavier application, and on lower-powered hardware that can matter. If you want pure mail with as little overhead as possible, Thunderbird usually wins.

KMail / Kontact is a strong choice if the desktop is KDE Plasma. On a Plasma system, it integrates naturally with the rest of the environment, and the contact/calendar side of Kontact can be very useful. For LinHES, though, this is a “choose it because you want KDE” option, not the default recommendation. If the distro build you are using is already themed and configured around KDE, then KMail makes a lot of sense. If not, it can feel like bringing a rather large toolbox to change a lightbulb.

Proton Mail and Tuta Mail deserve mention because a lot of people now prefer privacy-focused hosted email. Proton’s desktop app is straightforward if you are already in the Proton ecosystem, and Tuta is similarly service-specific. On LinHES, however, I would only choose them if you are committed to those services. They are not general-purpose mail clients in the same way as Thunderbird or Evolution. Also, their packaging model matters: Proton provides deb and rpm, which suits Debian-style systems better than Tuta’s appimage or flatpak focus. In other words, Proton is more naturally aligned to LinHES from a packaging point of view.

In contrast, Betterbird is technically interesting but not the best practical recommendation for LinHES. It is essentially a refined Thunderbird variant, and it can be very pleasant to use. The problem is deployment. Its packaging is less distro-friendly here because you are dealing with a tar.xz release rather than something that slots neatly into the system package manager. On a specialist distro like LinHES, I generally prefer software that can be installed and maintained cleanly. Betterbird is worth a look if you know exactly why you want it, but it is not the easiest recommendation for most users.

So, if I were advising a typical LinHES user, I would rank the options like this:

1. Thunderbird — best all-round choice
2. Evolution — best for calendar/contact-heavy office use
3. KMail / Kontact — best if LinHES is running KDE Plasma
4. Proton Mail — best for Proton users specifically
5. Tuta Mail — best for Tuta users specifically

The next question is how to install and configure the best three. I’ll focus on Thunderbird, Evolution, and KMail / Kontact, because those are the most realistic for a LinHES box.

Before installing anything, it is sensible to confirm the package source you intend to use. On LinHES, because the underlying system is Debian-like, the native package manager path is usually the least troublesome. If a package exists in the distribution repositories or can be installed as a deb, that is generally preferable to mixing in snaps or forcing a solution through a containerised package format unless you have a specific reason.

To install Thunderbird, the simplest approach on a Debian-style LinHES system is usually:

sudo apt update
sudo apt install thunderbird

If Thunderbird is not available in your configured repositories, you can use the official tarball from Thunderbird, but that is more of a manual maintenance route. For a system that values stability and low maintenance, the repository package is the better choice. Once installed, launch Thunderbird and add your email account. In most cases, you only need your name, email address, and password. Thunderbird will usually detect the incoming and outgoing settings automatically. If it does not, set the account to IMAP rather than POP unless you deliberately want mail stored locally only. IMAP is better for LinHES because the machine may not be your primary daily desktop, and server-side storage avoids awkward local sync issues.

For a Proton Mail account in Thunderbird, you should not expect native Proton access in the same way as the dedicated Proton app. You would normally use Proton Mail Bridge if you want traditional desktop client support. That is an important distinction. Proton’s own desktop app is more self-contained, but if your aim is a conventional client experience, Thunderbird plus Bridge is the usual model. If you go that route, install Proton’s desktop tooling from Proton Mail, then configure Thunderbird using the local Bridge-generated IMAP and SMTP details. That gives you a standard mail-client workflow while keeping Proton’s encrypted service layer intact.

To install Evolution, the most appropriate method on LinHES is usually either a package from the repository or a Flatpak if your repository selection is limited. A representative package-based install would look like this:

sudo apt update
sudo apt install evolution

If you need the Flatpak version from Flathub, make sure Flatpak is properly set up in your LinHES desktop session. Evolution is particularly good if you have an IMAP account plus calendar and contacts you want to keep in sync. When configuring it, follow the account wizard carefully and enable the address book and calendar components if your provider supports them. If you use Microsoft 365 or Exchange, Evolution is often more suitable than Thunderbird for the calendar side. On a LinHES installation, though, I would only choose it if you genuinely need that functionality, because it is a noticeably larger application than Thunderbird.

For KMail / Kontact, the same logic applies, but with an extra caveat: it is best if LinHES is actually using KDE Plasma. That way, the KDE PIM stack is part of the same desktop ecosystem rather than an add-on. If the package is available, installation is usually:

sudo apt update
sudo apt install kmail

Or, on some installs, you may need the broader Kontact suite:

sudo apt install kontact

After installation, launch KMail and configure your account via the wizard. Like Thunderbird, IMAP is usually the right choice. If you are using KMail within KDE Plasma, it will integrate nicely with KDE Wallet, calendar storage, and the rest of the PIM suite. If your desktop is not KDE-based, then I would be rather cautious. KMail still works, but it becomes less compelling when the whole rest of the system is not aligned with it.

There are a few practical recommendations I would make for LinHES users regardless of which client is chosen. First, keep account data server-synchronised wherever possible. A media-centre box is not the ideal place to treat email as a single local archive. Second, avoid installing too many overlapping clients, because one of the benefits of LinHES is keeping the system lean and dependable. Third, if the machine is mostly a living-room system, prefer a client with a clean tray icon, sensible notification behaviour, and easy font scaling that is one reason Thunderbird is often the best balance. Finally, if you are running the desktop on older hardware, keep an eye on memory usage. Evolution and Kontact are both capable, but they are not featherweight.

If your priorities are simplicity and compatibility, Thunderbird is the clear winner. If your priorities are groupware integration, Evolution is stronger. If your desktop is KDE-focused, KMail becomes the natural fit. That is the honest answer for LinHES: pick the client that matches both the desktop and the way the machine is actually used, rather than choosing the most feature-rich tool in the abstract.

As for mail services that pair well with this sort of setup, I would suggest looking at Proton Mail, Tuta Mail, Fastmail, and StartMail. Proton Mail and Tuta Mail are the obvious privacy-focused choices, and both work well if you are happy to use their own desktop clients or, in Proton’s case, a bridge-based setup with Thunderbird. Fastmail is excellent if you want a very polished IMAP-based service that behaves well with standard desktop clients and calendar/contact sync. StartMail is also a good fit if you want a privacy-conscious service with straightforward desktop compatibility. For LinHES in particular, I would lean towards Fastmail if you want the least troublesome experience with Thunderbird, and Proton Mail if you already live in the Proton ecosystem and want a tighter privacy story.

In short: for LinHES, keep it sensible, keep it light, and keep it compatible with the package ecosystem you actually have. Thunderbird is the safest general recommendation, Evolution is the best specialist option for productivity features, and KMail is a good match if the system is genuinely KDE-based. That combination gives you the strongest balance between usability and the practical realities of the distro.