There are quite a few email clients for Linux, but still not as many as on the Windows or macOS platform. Those moving from Windows may miss Outlook or the Mail app. Let's face it, you will not find direct alternatives to these programs. Still, there are good clients on Linux that have all the necessary features to fully work with e-mails.

Thunderbird

Mozilla Thunderbird

Mozilla Thunderbird cannot be called a simple email client, it also includes an address book, calendar, tasks. Thanks to its rich functionality, open source and free license, Thunderbird has become the default client in many distributions.

The presence of a large number of extensions is also important. With their help, you can easily customize the client to your needs. It is also worth noting the fact that Thunderbird does not overload emails with HTML code and does not use its own fonts, but only sets their style.

When connecting e-mail, you just need to enter your first and last name, address and password, and then send a request. Thunderbird will automatically configure and connect.

Features:
  • High level of security and privacy.
  • Fast and convenient mail filtering.
  • Built-in anti-spam tools.
  • The interface is very similar to the Mozilla Firefox browser. Therefore, it will be convenient for users of this browser to adapt.
  • Working with large files through cloud storage.

Mailspring

Mailspring

Mailspring is a simple and beautiful email client. Of course, you can download it for free. But in the regular version, only the most basic features are provided, you will have to pay for advanced functionality.

The free version is suitable for the undemanding user. The interface is not overloaded with elements, the buttons on the control panel appear only when they are really needed. Very handy email search.

Features of the free version:
  • The ability to change the theme, including the dark one.
  • Multiple accounts.
  • Automatic Spell Checker.
  • Translation of messages right inside the draft.
  • One box for all accounts.

Evolution

Evolution

The Evolution email client is a bit like Outlook. As in the case of Thunderbird, this is a whole organizer with a calendar and tasks.

All data in the application is encrypted, including user passwords. It also supports the ability to expand capabilities by installing third-party plug-ins, as in Thunderbird.

Features:
  • Email protection and encryption.
  • Calendar integration.
  • Ability to install extensions.
  • Search in folders and emails.
  • Filter emails by specified criteria.
  • Address book with support for user avatars.

Geary

The Geary email client is part of GNOME. This is clearly hinted at by the interface of the program. Like most applications for this platform, it has only basic functionality.

You can work with multiple accounts, read and send emails, search among them, and nothing more. Geary lacks simple things like customizing the interface and creating folders. This email client is suitable only for simple tasks.

Features:
  • Search by accounts and emails.
  • Multiple accounts.

Sylpheed

Sylpheed

Sylpheed is positioned as a fast, reliable and free email client. The speed is its main advantage, it almost never slows down and doesn't load the system. Users claim that the application can work without freezes if there are several hundred or thousands of messages in the folder.

The program has pre-set parameters for easier connection of your Gmail account. But when connecting other accounts, you'll have to deal with manual settings.

Features:
  • High application speed. The client is written in C.
  • Simplicity and ease in management.
  • Powerful filters and fast search.
  • Built-in spam filters.
  • Quick connection to your Gmail account.
  • Ability to install extensions.
  • High level of privacy and security.

TypeApp Mail

TypeApp Mail

TypeApp Mail is a fairly simple email client. The most pleasant thing about the client, perhaps, is the interface. There is no limit on the number of profiles. Adding a new profile will not be a problem, switching between mailboxes too. There is support for the night theme, sorting and filtering letters.

Features:
  • Night theme.
  • Fast and convenient filtering.
  • Connect an unlimited number of email accounts.

KMail

KMail

The Kmail email client is part of the Kontact platform for KDE, but it's also great for use in GNOME or any other environment. There is a function for displaying HTML, creating folders, blocking spam, filtering letters, as well as searching through folders and emails.

One thing can be said about management, all the elements are laid out where necessary, that is, the client is well thought out. It may not be the best email client, but it does its job just as well as Thunderbird.

Features:
  • Display emails both as text and as HTML.
  • High level of security, encryption, built-in antivirus, antispam.
  • Ability to import settings from other email clients
  • Possibility of color selection.
  • Display the sender's avatar.

Claws Mail

Claws Mail

The Claws Mail project started out as a test version of Sylpheed for debugging new features, but soon grew into a standalone email client. The division happened back in 2005, but even now the clients have a lot in common.

It's strange that neither one nor the other has acquired a new interface. It's not very convenient to work with overloaded menus, when this problem was solved a long time ago in the same Outlook or Thunderbird, using the tab system.

Mutt

Mutt email client

The turn of clients working directly in the Terminal has come, and Mutt is the first in line. Yes, it is very light and fast, but not everyone can use it. Personally, I managed with great difficulty to set it up properly and send a test email. Management is carried out only with the help of hot keys.

This client cannot render HTML components, so the readability of many emails can be significantly reduced.

Features:
  • Multiple accounts.
  • IMAP and POP3 support.
  • Delivery Status Notification (DSN) support.
  • Configuration via config files.

Sup

Sup, like the previous e-mail client, works from the terminal. The only difference from the previous one is that this client was made to work with a large number of letters.

Features:
  • Quick search.
  • Multiple accounts.
  • Automatic contact list management.
  • High level of privacy.
After testing most of the email clients below, I have come to the conclusion that the best alternative to Outlook on Linux is Mozilla Thunderbird. First, Thunderbird supports almost all the features that are available in Outlook, and even more. Secondly, Thunderbird is an open source project, which for some may be a huge advantage.