Email Client for Linux: Best Linux Mail Clients

Thunderbird is still the default answer for a Linux email client with multiple accounts, and for most people it is the right one. It is in every distribution's repositories, it speaks IMAP properly, and its Unified Folders view genuinely merges several mailboxes into one list. The catch is that the view ships switched off, and the setup lives on the one machine you installed it on.

This walks through the Linux mail clients that actually handle several accounts in one view, what each one does well, and the one route that needs no package manager at all.

What is the best email client for Linux?

Thunderbird, unless you already know you want something desktop native, terminal based, or independent of the machine. That caveat matters more than it sounds, because Linux is the one platform where the usual cross platform clients simply are not available. Mailbird, eM Client, Spark, Canary and Mimestream all skip Linux entirely. The field is smaller here, and it is mostly open source.

Linux mail clients that hold several accounts

Pick by desktop environment first if you care about the app looking native. Geary and Evolution are GNOME programs, KMail belongs to KDE's Kontact suite, and Thunderbird looks equally at home and equally foreign on both.

Does Linux have a built in email client?

It depends entirely on the distribution, which is the answer to a surprising number of Linux questions. Fedora Workstation and several GNOME based distributions ship Evolution. Some KDE spins ship KMail as part of Kontact. Ubuntu's default desktop install has shipped without a mail client for years, and Linux Mint includes Thunderbird.

So there is no single built in Linux email client the way macOS has Apple Mail. If your distribution gave you one, it will handle multiple IMAP accounts fine. If it did not, Thunderbird is one command away in every package manager, plus Flatpak and Snap if you prefer those.

What email clients work on Ubuntu?

All of them. Ubuntu has the widest package availability of any Linux distribution, so Thunderbird, Evolution, Geary, KMail, Claws Mail and Mailspring are all installable, and BlueMail publishes a Linux build too. Thunderbird is in the main repositories and is also a Snap on recent Ubuntu releases.

The practical question on Ubuntu is not what is available but what survives a distribution upgrade with your accounts and folders intact. Thunderbird's profile directory is stable and portable, which is a real advantage if you reinstall often. Clients that store configuration in less predictable places are the ones people lose accounts from.

Is Thunderbird still the best email client for Linux?

Yes for most people, and the honest reason is the lack of serious competition rather than Thunderbird being flawless. It handles unlimited IMAP accounts, keeps a full local archive so you can work offline, has OpenPGP encryption built in, and its Unified Folders view is a real merged inbox rather than a saved search.

Two things are worth knowing before you settle on it. Unified Folders is not enabled out of the box: you turn it on in the folder pane view options, and until you do, Thunderbird shows a separate tree per account, which is why people often assume it has no merged view at all. Our walkthrough of the unified inbox in Thunderbird covers the exact setting. The second thing is that Thunderbird does no automatic sorting. It filters on rules you write yourself, per condition, and there is no model reading messages and deciding what they are.

Which Linux email client has a unified inbox?

Thunderbird, Geary, KMail, Mailspring and BlueMail all merge accounts into one view. Evolution technically can, using search folders, but a search folder is a saved query that runs across accounts rather than a live inbox, so archiving and unread state behave differently from what you expect. Claws Mail keeps each account in its own tree and does not merge them.

Worth being clear about what a merged view does and does not fix. Four mailboxes at 40 messages a day become one mailbox at 160 messages a day. You stop switching windows, which is worth something, but the pile is the same size and now the newsletters from your personal account sit directly above the invoice from the work one. If gathering is genuinely your whole problem, any of the clients above solves it at no cost and you should stop reading here.

Can you run Outlook on Linux?

Not as a desktop application. Microsoft has never shipped a native Linux build of Outlook, and the workarounds people reach for are Outlook on the web in a browser, running the Windows version under Wine, or a virtual machine. The web version works and is the only one worth considering, but it shows one Microsoft account and will not sit alongside your Gmail and your own domain in a single list.

This is also where Linux users hit the authentication wall that catches everyone in this category. Microsoft finished retiring basic authentication for SMTP AUTH in Exchange Online in April 2026, having removed it from IMAP and POP earlier. A Microsoft 365 work or school mailbox now expects OAuth, so any client that connects with a username and password will be refused, on Linux exactly as on any other platform. Personal Outlook.com and Hotmail addresses are a different case and normally still connect over IMAP.

How do I set up multiple email accounts in a Linux email client?

The mechanics are the same in every client on the list. Add each account with its IMAP host and port, then repeat. The part that stops most people is the credential, not the settings.

1. Generate an app password for each provider. Once two step verification is on, Gmail, iCloud and Yahoo will all refuse your normal account password from a third party client and want a generated one instead, created in account security settings. This is the single most common reason a Linux mail setup fails on the first try, and it looks exactly like a wrong password error. We cover what these are and why they exist in the guide to app passwords.
2. Add the account with IMAP, not POP. IMAP leaves mail on the server and syncs your actions back. POP downloads and, depending on settings, removes it, which is how people end up with mail on one machine and nowhere else.
3. Use port 993 with SSL or TLS for incoming and port 587 with STARTTLS for outgoing on nearly every major provider. Most clients detect this from the address and you never see it.
4. Turn the merged view on. In Thunderbird this is the folder pane view switch to Unified Folders. In KMail it is the unified mailboxes setting. Geary combines accounts by default.
5. Rebuild your filters per account, or accept that you will not. This is the quiet cost of desktop clients: rules are usually scoped per account, so the same filter gets written five times.

The full provider by provider settings table, including iCloud, Yahoo, Zoho, Fastmail and custom domains, is in our guide to adding multiple email accounts to one app.

Do I need to install anything to read email on Linux?

No, and this is the one place where Linux users have a structural advantage that rarely gets pointed out. Every serious commercial email client skips Linux, so Linux users are used to being the platform an app does not support. A client that runs in the browser has no platform to skip. There is no package, no Flatpak, no Snap, no PPA, no dependency that breaks on the next release, and no distribution specific build to wait for.

It also solves the machine problem. A desktop client builds its merged view on the computer it is installed on, so a workstation and a laptop means configuring accounts twice and keeping two sets of rules in sync. That is the same reason people running infrastructure moved to browser based tooling for everything else on the machine, from monitoring dashboards to the console they use to provision servers and push deploys. Mail is usually the last thing left running locally, largely out of habit.

The trade is real and worth stating: a browser based client generally needs a connection, and it will not keep a full local archive the way Thunderbird does. If you work offline for hours at a time, that is a genuine reason to stay on a desktop client, and Thunderbird is the best of them.

When paying for an email client makes sense on Linux

Almost never, if merging is all you want. The open source options on this list are good, and Thunderbird in particular is a mature program maintained by people who care about email as a protocol rather than as a growth channel.

Paying starts to make sense when the number of messages is the problem rather than the number of windows. None of the free Linux clients read a message and decide what it is. They apply rules you wrote, in the order you wrote them, and every new sender is a new rule. If you run four or more busy mailboxes and lose real time each morning working out what each message is before you can act, that is the gap a sorting layer fills, and it is the reason our own product exists. Email management software as a category splits into several very different products, and it is worth knowing which one you are shopping for before you compare prices.

If you want the wider comparison across platforms rather than Linux specifically, our roundup of the best apps for multiple email accounts compares nine of them and says which we would recommend over ourselves in which situation.