Alternatives to Postbox for all platforms with any license

  • Thunderbird icon

    Thunderbird

    Thunderbird is a free, open source, cross-platform e-mail, news and instant messaging client. The project strategy is modeled after...

    Open Source Mac Windows Linux BSD Haiku

  • Inbox by Gmail icon

    Inbox by Gmail

    Built on everything that we've learned from Gmail, Inbox is a fresh start that goes beyond email to help you get back to what...

    Free Web / Cloud Android iPhone iPad Chrome

  • Mailbird icon

    Mailbird

    The Best Email Client for Windows 7, 8 & 10 - Mailbird is more than just another email client. It's an all-in-one...

    Freemium Windows

  • Apple Mail icon

    Apple Mail

    There’s big news attached. The best way to manage email on a Mac gets even better with OS X Yosemite.

    Free Mac iPhone iPad

  • Evolution icon

    Evolution

    Evolution is the official personal information manager and workgroup information management tool for GNOME. It combines e-mail...

    Open Source Linux BSD GNOME

  • eM client icon

    eM client

    Fully functional alternative to Microsoft Outlook, including native interoperability with Exchange servers.

    Freemium Windows

  • Sparrow icon

    Sparrow Discontinued

    Sparrow is a minimalist mail application for Mac. It was designed to keep things simple and efficient. No fancy stuff here... just...

    Commercial Mac iPhone

  • Claws Mail icon

    Claws Mail

    Claws Mail is an email client (and news reader), based on GTK+, featuring Quick response Graceful, and sophisticated...

    Open Source Windows Linux Xfce

  • Geary icon

    Geary Discontinued

    Geary is a lightweight email program designed around conversations and built for the GNOME...

    Open Source Linux BSD GNOME

  • Airmail icon

    Airmail

    Airmail is a lightweight and lightning fast mail client for Mac. Feature list: Accounts: - Unified Inbox and folders - Multi...

    Commercial Mac iPhone iPad Apple Watch

  • Windows Live Mail icon

    Windows Live Mail

    Windows Live Mail (formerly named Windows Live Mail Desktop) is a freeware email client from Microsoft. It is the successor to Outlook...

    Free Windows

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  • Sylpheed

    Sylpheed is a simple, lightweight but featureful, and easy-to-use e-mail client (mailer, MUA). Sylpheed runs on Unix-like systems...

    Open Source Mac Windows Linux BSD Xfce

  • EssentialPIM icon

    EssentialPIM

    EssentialPIM lets you manage appointments, tasks, notes, contacts, password entries and email messages across multiple devices and...

    Freemium Windows Android iPhone

  • Inky icon

    Inky

    Inky pulls together all your personal and work email accounts into one place. By providing simple tools to manage your inbox, Inky...

    Commercial Mac Windows Android iPhone Android Tablet iPad

  • Mutt icon

    Mutt

    Mutt is a small but very powerful text-based mail client for Unix operating systems. Some of its features are: color support, message...

    Open Source Mac Windows Linux Xfce

  • Mailbox icon

    Mailbox Discontinued

    Mailbox is a completely redesigned inbox that makes email light, fast, and mobile-friendly. Quickly swipe messages to your archive or...

    Free Mac Android iPhone iPad

  • N1 icon

    N1

    N1 is an email client designed to be friendly and easy to use but also powerful and highly extensible. It works "out of the...

    Open Source Mac Windows Linux

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  • The Bat icon

    The Bat

    The Bat! is a secure email client software, built to protect your correspondence against third-parties. The Bat! protects your...

    Commercial Windows

  • Zimbra Desktop icon

    Zimbra Desktop

    The free Zimbra Desktop client allows you to meld the online and offline worlds – storing and synching your email, calendar, contacts...

    Free Personal Mac Windows Linux

  • Kontact icon

    Kontact

    Kontact is the integrated Personal Information Manager of KDE. Kontact suite unites mature and proven KDE PIM applications under...

    Open Source Windows Linux

  • Kontact - KMail icon

    Kontact - KMail

    KMail is the email component of Kontact, the integrated personal information manager of KDE. Kontact is a personal information manager...

    Open Source Mac Windows Linux BSD

  • Email.biz icon

    Email.biz

    Indian Webmail service allowing people to sign up for an @email.biz mail account. Cloud based Login and Multiple Login System give...

    Free Web / Cloud

  • ALTO icon

    ALTO

    ALTO is a webmail provider which connects to existing mail accounts. Currently AOL, Gmail, Yahoo, iCloud and any IMAP email service...

    Free Web / Cloud

  • Mailplane icon

    Mailplane

    You like threaded conversations, googling your inbox, and you prefer labels over folders. You really love Gmail. If yes: You've...

    Commercial Mac

  • sup icon

    sup

    Sup is a console-based email client for people with a lot of email. It supports tagging, very fast full-text search, automatic...

    Open Source Linux

  • nPOPuk icon

    nPOPuk

    nPOPuk is an ultra-small, but comprehensive, e-mail client that runs on a wide range of Windows-based operating systems

    Free Windows Windows Mobile

  • Trojitá icon

    Trojitá

    Trojitá, is a fast Qt IMAP e-mail client that respects open standards and facilitates modern technologies. Trojitá values...

    Open Source Windows Linux

  • Mail Pilot icon

    Mail Pilot

    Experience intuitive email with a simple, task-oriented approach. Quickly manage and productively organize your Inbox with Mail Pilot...

    Commercial Mac iPhone iPad

  • Mail icon

    Mail

    With the Mail application for Windows 8.1 you can now easily see all message from your favorite people, more clearly organize social...

    Free Windows RT

  • FossaMail icon

    FossaMail

    FossaMail is an Open Source, Mozilla Thunderbird -based mail, news and chat client for Windows and Linux, brought to you by...

    Open Source Windows Linux

  • Unibox icon

    Unibox

    Unibox is a people centric email client that organizes your messages by person. It avoids having email like a to-do list. Features:...

    Commercial Mac

  • Polymail icon

    Polymail

    The most powerful platform for email productivity in a beautiful native app — on desktop and mobile.

    Free Mac iPhone iPad

  • Becky! Internet Mail icon

    Becky! Internet Mail

    Becky! Internet Mail is an email client for Windows OS. Becky! Internet Mail supports POP3, IMAP and S/MIME as well as PGP/PGP via...

    Commercial Windows