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Mail-in-a-Box alternatives · Email

Mail-in-a-Box alternatives with a Mac app

The Mail-in-a-Box listing does not include a Mac app. 43 of the 125 other email apps in this directory list a Mac app.

Mail-in-a-Box is free to use. 26 of them are free or have a free plan.

43 tools · Listings checked up to Nov 13, 2026 · Where the facts come from

The 12 closest to Mail-in-a-Box

  1. Zimbra

    Self-hosted email, calendar and file sharing for organizations

    • Mail-in-a-Box has a free plan. Zimbra does not.
    • Only Zimbra lists Windows, macOS, Linux, iOS and Android apps.
    • Zimbra also covers tasks.
    Zimbra pricing and details

  2. Proton Mail

    End-to-end encrypted email service based in Switzerland

    • Proton Mail starts at $3.99 per month, billed every 12 months ($47.88); $4.99 billed monthly. Mail-in-a-Box is free.
    • Only Proton Mail lists macOS, Windows, Linux, iOS and Android apps.
    • Proton Mail is end-to-end encrypted, according to its own site.
    • Mail-in-a-Box is self-hostable, according to its own site.
    Proton Mail pricing and details

  3. Thunderbird

    Free, open-source email app for Windows, macOS, Linux and Android

    • Thunderbird is free. Mail-in-a-Box is free.
    • Only Thunderbird lists Windows, macOS, Linux and Android apps.
    • Only Mail-in-a-Box lists a web app.
    • Mail-in-a-Box is self-hostable, according to its own site.
    Thunderbird pricing and details

  4. Tuta Mail

    End-to-end encrypted email and calendar from Germany

    • Tuta Mail starts at €3 per month, paid yearly (lowest paid personal plan). Mail-in-a-Box is free.
    • Only Tuta Mail lists Windows, macOS, Linux, iOS and Android apps.
    • Tuta Mail is end-to-end encrypted, according to its own site.
    • Mail-in-a-Box is self-hostable, according to its own site.
    Tuta Mail pricing and details

  5. Inbox Zero

    Open source AI email assistant for Gmail and Outlook

    • Inbox Zero starts at $18 per user / month, billed annually ($20 billed monthly). Mail-in-a-Box is free.
    • Mail-in-a-Box has a free plan. Inbox Zero does not, though it has a free trial.
    • Only Inbox Zero lists macOS, Windows, iOS and Android apps.
    • Only Inbox Zero lists a browser extension.
    Inbox Zero pricing and details

  6. Betterbird

    A fork of Thunderbird with extra features and bug fixes

    • Betterbird is free. Mail-in-a-Box is free.
    • Only Betterbird lists Windows, macOS and Linux apps.
    • Only Mail-in-a-Box lists a web app.
    • Mail-in-a-Box is self-hostable, according to its own site.
    Betterbird pricing and details

  7. MDaemon

    Email server for Windows with webmail and Outlook connector

    • Mail-in-a-Box has a free plan. MDaemon does not, though it has a free trial.
    • Only MDaemon lists Windows and macOS apps.
    • Mail-in-a-Box is open source, according to its own site.
    MDaemon pricing and details

  8. GFI KerioConnect

    Self-hosted business mail server with calendar, chat and local AI

    • Mail-in-a-Box has a free plan. GFI KerioConnect does not, though it has a free trial.
    • Only GFI KerioConnect lists Windows, macOS and Linux apps.
    • Only Mail-in-a-Box lists a web app.
    • Mail-in-a-Box is open source, according to its own site.
    GFI KerioConnect pricing and details

  9. Superhuman Mail

    Keyboard-driven email client for Gmail and Outlook with built-in AI

    • Superhuman Mail starts at $25 per member / month, billed annually ($30 billed monthly). Mail-in-a-Box is free.
    • Mail-in-a-Box has a free plan. Superhuman Mail does not.
    • Only Superhuman Mail lists macOS, Windows, iOS and Android apps.
    • Only Superhuman Mail lists a browser extension.
    Superhuman Mail pricing and details

  10. Spark Mail

    Email client with a unified smart inbox, AI tools and team features

    • Spark Mail starts at $8.25 per user / month, billed annually ($99 / year). Mail-in-a-Box is free.
    • Only Spark Mail lists macOS, Windows, iOS and Android apps.
    • Only Mail-in-a-Box lists a web app.
    • Mail-in-a-Box is open source and self-hostable, according to its own site.
    Spark Mail pricing and details

  11. HEY

    Email service and calendar with sender screening, from 37signals

    • HEY starts at $99 per year (HEY for You, annual billing only). Mail-in-a-Box is free.
    • Mail-in-a-Box has a free plan. HEY does not, though it has a free trial.
    • Only HEY lists macOS, Windows, Linux, iOS and Android apps.
    • Mail-in-a-Box is open source and self-hostable, according to its own site.
    HEY pricing and details

  12. Microsoft Outlook

    Microsoft's email and calendar app for desktop, mobile and web

    • Microsoft Outlook starts at $1.99 per month, or $19.99 per year (Microsoft 365 Basic). Mail-in-a-Box is free.
    • Only Microsoft Outlook lists Windows, macOS, iOS and Android apps.
    • Mail-in-a-Box is open source and self-hostable, according to its own site.
    • Microsoft Outlook also covers tasks and inbox filtering.
    Microsoft Outlook pricing and details

31 more that list a Mac app

All 43 in one table

Common questions

Which Mail-in-a-Box alternatives have a Mac app?

Zimbra, Proton Mail, Thunderbird, Tuta Mail, Inbox Zero, Betterbird, MDaemon, GFI KerioConnect and 35 more list a Mac app.

Does Mail-in-a-Box have a Mac app?

The Mail-in-a-Box listing does not include a Mac app. It lists Web.

Which of these email apps are free?

Proton Mail, Thunderbird, Tuta Mail, Betterbird, Spark Mail, Microsoft Outlook, Zoho Mail, Canary Mail and 18 more are free or have a free plan.

When was this checked?

Each listing shows its own date. On this page they run from Oct 4, 2026 to Nov 13, 2026. Vendors change prices and plans without notice, so confirm on their site before you buy.

This page is built from the listings. A tool is here because its listing says so, and the order is how close each is to Mail-in-a-Box: the alternatives its listing names first, then the tools that share the most features with it.