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IceWarp alternatives · Email

Open-source alternatives to IceWarp

IceWarp is not described as open source on its own site. 39 of the 125 other email apps in this directory are open source, according to their own sites.

IceWarp is a paid product with a free trial, starting at $1.50 per user / month, billed monthly ($1.35 billed annually). 33 of them are free or have a free plan.

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

The 12 closest to IceWarp

  1. Zimbra

    Self-hosted email, calendar and file sharing for organizations

    • Only Zimbra lists a Linux app.
    • Zimbra is open source and self-hostable, according to its own site.
    • Zimbra also covers tasks.
    • IceWarp also covers team chat, video calls and file sharing.
    Zimbra vs IceWarpZimbra pricing and details

  2. Open-Xchange

    OX App Suite email platform sold to providers and governments

    • Only IceWarp lists Windows, macOS, iOS and Android apps.
    • Open-Xchange is open source and self-hostable, according to its own site.
    • IceWarp also covers team chat, video calls and file sharing.
    Open-Xchange vs IceWarpOpen-Xchange pricing and details

  3. BlueMind

    Open-source collaborative email and calendar with Outlook support

    • Only IceWarp lists Windows, macOS, iOS and Android apps.
    • BlueMind is open source, according to its own site.
    • BlueMind also covers shared inbox.
    • IceWarp also covers team chat, video calls and file sharing.
    BlueMind vs IceWarpBlueMind pricing and details

  4. hMailServer

    Free open-source mail server that runs on Windows

    • hMailServer is free. IceWarp starts at $1.50 per user / month, billed monthly ($1.35 billed annually).
    • hMailServer has a free plan. IceWarp does not, though it has a free trial.
    • Only IceWarp lists a web app.
    • Only IceWarp lists macOS, iOS and Android apps.
    hMailServer vs IceWarphMailServer pricing and details

  5. Stalwart Mail Server

    Open-source mail and collaboration server written in Rust

    • Stalwart Mail Server starts at $2.40 per mailbox / year, billed annually (25-mailbox minimum). IceWarp starts at $1.50 per user / month, billed monthly ($1.35 billed annually).
    • Stalwart Mail Server has a free plan. IceWarp does not, though it has a free trial.
    • Only IceWarp lists Windows, macOS, iOS and Android apps.
    • Stalwart Mail Server is open source and self-hostable, according to its own site.
    Stalwart Mail Server pricing and details

  6. Kolab Now

    Swiss-hosted email, calendars, contacts and tasks

    • Kolab Now starts at CHF 9.90 per month (Group Account). IceWarp starts at $1.50 per user / month, billed monthly ($1.35 billed annually).
    • Only IceWarp lists Windows, macOS, iOS and Android apps.
    • Kolab Now is open source, according to its own site.
    • Kolab Now also covers tasks.
    Kolab Now pricing and details

  7. 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. IceWarp starts at $1.50 per user / month, billed monthly ($1.35 billed annually).
    • Proton Mail has a free plan. IceWarp does not, though it has a free trial.
    • Only Proton Mail lists a Linux app.
    • Proton Mail is open source and end-to-end encrypted, according to its own site.
    Proton Mail pricing and details

  8. Thunderbird

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

    • Thunderbird is free. IceWarp starts at $1.50 per user / month, billed monthly ($1.35 billed annually).
    • Thunderbird has a free plan. IceWarp does not, though it has a free trial.
    • Only Thunderbird lists a Linux app.
    • Only IceWarp lists a web app.
    Thunderbird pricing and details

  9. Tuta Mail

    End-to-end encrypted email and calendar from Germany

    • Tuta Mail starts at €3 per month, paid yearly (lowest paid personal plan). IceWarp starts at $1.50 per user / month, billed monthly ($1.35 billed annually).
    • Tuta Mail has a free plan. IceWarp does not, though it has a free trial.
    • Only Tuta Mail lists a Linux app.
    • Tuta Mail is open source and end-to-end encrypted, according to its own site.
    Tuta Mail pricing and details

  10. Posteo

    Ad-free, green-powered email from Berlin for €1 a month

    • Posteo starts at €1 per month, prepaid (minimum top-up €12). IceWarp starts at $1.50 per user / month, billed monthly ($1.35 billed annually).
    • Only IceWarp lists Windows, macOS, iOS and Android apps.
    • Posteo is open source and end-to-end encrypted, according to its own site.
    • Posteo also covers notes.
    Posteo pricing and details

  11. Wino Mail

    Free, open source mail and calendar app for Windows

    • Wino Mail has a free plan. IceWarp does not, though it has a free trial.
    • Only IceWarp lists a web app.
    • Only IceWarp lists macOS, iOS and Android apps.
    • Wino Mail is open source, according to its own site.
    Wino Mail pricing and details

  12. Evolution

    GNOME's free mail, calendar and address book app

    • Evolution is free. IceWarp starts at $1.50 per user / month, billed monthly ($1.35 billed annually).
    • Evolution has a free plan. IceWarp does not, though it has a free trial.
    • Only Evolution lists a Linux app.
    • Only IceWarp lists a web app.
    Evolution pricing and details

27 more that are open source

All 39 in one table

Common questions

Is there an open-source alternative to IceWarp?

Yes. Zimbra, Open-Xchange, BlueMind, hMailServer, Stalwart Mail Server, Kolab Now, Proton Mail, Thunderbird and 31 more are open source, according to their own sites.

Is IceWarp open source?

IceWarp is not described as open source on its own site. The listing was checked on Nov 13, 2026 against the pages it cites.

Which of these email apps are free?

hMailServer, Stalwart Mail Server, Proton Mail, Thunderbird, Tuta Mail, Wino Mail, Evolution, Betterbird and 25 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 IceWarp: the alternatives its listing names first, then the tools that share the most features with it.