Postbox Alternatives for Linux

Postbox is not available for Linux but there are plenty of alternatives that runs on Linux with similar functionality. The best Linux alternative is Thunderbird, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 50 alternatives to Postbox and many of them are available for Linux so hopefully you can find a suitable replacement. Other interesting Linux alternatives to Postbox are Evolution, Mailspring, Geary and Claws Mail.

Postbox alternatives are mainly Email Clients but may also be Calendar Apps or Todo List Managers. Filter by these if you want a narrower list of alternatives or looking for a specific functionality of Postbox.

This page was last updated

Postbox

151

Paid • Proprietary
Email Client

Mac
Windows

Postbox is an email application that helps you organize your work life and get stuff done.

Learn more about Postbox

Thunderbird
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Yes
No
Free • Open Source
Email Client
Calendar App
Mac
Windows
Linux
BSD
AppImageHub
Snapcraft
Flathub
PortableApps.com
Haiku
Homebrew
Chocolatey
93 alternatives to Thunderbird
Thunderbird is a free, open source, cross-platform e-mail, news and instant messaging client. The project strategy is modeled after Mozilla Firefox.
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Thunderbird Features
1. Extensible by Plugins/ExtensionsThunderbird can be extended with add-ons, plugins and extensions.
2. Multiple Account supportThunderbird support multiple accounts without the need to logout and login
3. Calendar IntegrationThunderbird lets you sync your tasks and events with your calendar application.
4. Email OrganizerThunderbird allows you to take control of your inbox by filtering and control tools.
5. Dark ModeThunderbird supports dark mode for comfortable usage in low light conditions.
6. Import/Export OPML FeedsImport and export your feed subscriptions into OPML format with Thunderbird.
7. PortableThunderbird can be used from a USB stick or similar with no prior installation.
8. Support for ThemesYou can use themes and templates to change the look and feel of Thunderbird.
9. Integrated Password ManagerThunderbird lets you access all the passwords you’ve saved across your different devices.
IMAP Support
SMTP Support
FOSS
Built-in RSS reader
POP3 Support
Add-ons
Intuitive
Graphical User Interface
Customizable
Built-in Calendar
Thunderbird vs Postbox opinions
Most users think Thunderbird is a great alternative to Postbox.
Evolution
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Yes
No
Free • Open Source
Email Client
Calendar App
Linux
BSD
S/MIME
GNOME
OpenPGP
Flathub
82 alternatives to Evolution
Evolution is a personal information management application that provides integrated mail, calendaring, address book and task list functionality. Evolution supports a wide range of industry standard data formats and network protocols for information exchange, with an emphasis on...
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Evolution Features
1. Calendar IntegrationEvolution lets you sync your tasks and events with your calendar application.
2. Calendar ViewEvolution has a built-in calendar view to have a clear overview of your content over time.
3. Ad-freeEvolution doesn't contain any form of external advertising.
4. Multiple Account supportEvolution support multiple accounts without the need to logout and login
5. GPG EncryptionEvolution supports GPG (aka GnuPG) for encryption of things like emails, messages, files, etc.
6. Spam FilterEvolution can detect unsolicited, unwanted and virus-infected emails, calls, files, etc.
7. RemindersEvolution allows you to set reminders for tasks, events or actions, based on parameters of time, place or condition.
8. Sync with Google CalendarEvolution can be synchronized with Google Calendar
Contacts
CalDAV Support
Encrypted Email
CardDAV Support
Personal Information Manager (PIM)
IMAP Support
Exchange
POP3 Support
Multiple languages
Integrated Spam Protection
Mailspring
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Yes
No
Freemium • Open Source
Email Client
Mac
Windows
Linux
Arch Linux
Fedora
Ubuntu
45 alternatives to Mailspring
Boost your productivity and send better email with Mailspring, a beautiful, fast email client for Mac, Windows, and Linux. Mailspring is free to use and an optional pro version adds read receipts, send later, reminders and more.
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Mailspring Features
1. Unified inboxView e-mails (or similar) from all accounts in one unified view with Mailspring.
2. Multiple Account supportMailspring support multiple accounts without the need to logout and login
3. Dark ModeMailspring supports dark mode for comfortable usage in low light conditions.
4. Support for ThemesYou can use themes and templates to change the look and feel of Mailspring.
5. Ad-freeMailspring doesn't contain any form of external advertising.
6. Email OrganizerMailspring allows you to take control of your inbox by filtering and control tools.
7. Extensible by Plugins/ExtensionsMailspring can be extended with add-ons, plugins and extensions.
Customizable
Email tracking
User friendly
Snooze Mail
Built-in translation
Built-in themes
Auto Update
Notifications
Sidebar
Theme Customization
Geary
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Yes
No
Free • Open Source
Email Client
Linux
BSD
GNOME
Flatpak
Flathub
52 alternatives to Geary
Geary is an email application built around conversations, for the GNOME 3 desktop.
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Geary Features
1. Multiple Account supportGeary support multiple accounts without the need to logout and login
2. Dark ModeGeary supports dark mode for comfortable usage in low light conditions.
3. LightweightGeary consumes less device resources compared to similar apps.
4. Spam FilterGeary can detect unsolicited, unwanted and virus-infected emails, calls, files, etc.
5. Ad-freeGeary doesn't contain any form of external advertising.
6. Privacy focusedGeary is considered a privacy friendly alternative.
7. Email OrganizerGeary allows you to take control of your inbox by filtering and control tools.
Conversational email approach
SMTP Support
IMAP Support
Labels for content
Gmail integration
Multiple languages
Claws Mail
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Yes
No
Free • Open Source
Email Client
Calendar App
News Reader
Windows
Linux
BSD
83 alternatives to Claws Mail
Claws Mail is an email client (and news reader), based on GTK+, featuring

Quick response Graceful, and sophisticated interface Easy configuration, intuitive operation Abundant features Extensibility Robustness and stability.
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Claws Mail Features
1. LightweightClaws Mail consumes less device resources compared to similar apps.
2. Extensible by Plugins/ExtensionsClaws Mail can be extended with add-ons, plugins and extensions.
3. Multiple Account supportClaws Mail support multiple accounts without the need to logout and login
4. No registration requiredYou can use most of the features in Claws Mail without registration.
5. Import/Export OPML FeedsImport and export your feed subscriptions into OPML format with Claws Mail.
6. Spam FilterClaws Mail can detect unsolicited, unwanted and virus-infected emails, calls, files, etc.
7. PortableClaws Mail can be used from a USB stick or similar with no prior installation.
IMAP Support
Customizable
Multiple languages
Integrated Email Client
Content Filtering
Built-in RSS reader
Mutt
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Yes
No
Free • Open Source
Email Client
Mac
Windows
Linux
Xfce
56 alternatives to Mutt
Mutt is a small but very powerful text-based mail client for Unix operating systems. Some of its features are: color support, message threading, MIME support (including RFC2047 support for encoded headers), PGP/MIME (RFC2015), various features to support mailing lists, including...
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Mutt Features
1. PGP EncryptionMutt supports PGP, an encryption system used for sending encrypted emails and files.
2. Command line interfaceMutt either have CLI support or is a CLI-only app.
Tui
Console-based
Text-based
IMAP Support
POP3 Support
S/MIME Support
Kontact - KMail
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Yes
No
Free • Open Source
Email Client
Linux
BSD
59 alternatives to Kontact - KMail
KMail is the email component of Kontact, the integrated personal information manager of KDE. Kontact is a personal information manager and groupware software suite for KDE. It supports calendars, contacts, notes, to-do lists, news, and email.
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Kontact - KMail Features
1. Email OrganizerKontact - KMail allows you to take control of your inbox by filtering and control tools.
Encryption methods
Kontact
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Yes
No
Free • Open Source
Email Client
Calendar App
Contact Manager
Linux
112 alternatives to Kontact
Personal Information Manager (Mail, Contact, Calendar and more).
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Kontact Features
Google integration
Convert Email to Task
KDE
Feed Reader
Personal Information Manager (PIM)
Contacts
LucaMail
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Yes
No
Free • Open Source
Email Client
Mac
Windows
Linux
75 alternatives to LucaMail
LucaMail is an open source, cross-platform email client. LucaMail is developed to provide cross-platform alternative to Email Clients that are really exists. LucaMail focuses on modern technologies as well as maintaining a user-friendly UI.
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LucaMail Features
1. Dark ModeLucaMail supports dark mode for comfortable usage in low light conditions.
IMAP Support
Discontinued
Repository marked as archived as of Dec 24, 2022. No new releases since May 26, 2022.
Sylpheed
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Yes
No
Free • Open Source
Email Client
Mac
Windows
Linux
BSD
PortableApps.com
48 alternatives to Sylpheed
Sylpheed is a simple, lightweight but featureful, and easy-to-use e-mail client (mailer, MUA).
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Sylpheed Features
1. LightweightSylpheed consumes less device resources compared to similar apps.
2. PortableSylpheed can be used from a USB stick or similar with no prior installation.
Gtk
POP3 Support
IMAP Support