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Alternatives

Best mailbox.org alternatives in 2026

mailbox.org is german email, drive and calendar hosted in German data centers. These 5 alternatives come from the same rankings, ordered by editorial score. Connected products carry a small, disclosed lift.

5 alternatives From best secure email providers How we rank

Ranked alternatives

  1. 1

    Proton Mail

    Has a free option; is open source; also runs on iOS, Android, macOS. Zero-access encryption, a free plan and apps on every major platform, with the web client published under GPL-3.0. Custom domains and extra storage need the paid plans.

    Best for Private email with a free plan and apps

    WebiOSAndroidmacOSWindowsLinuxFree plan, paid upgradesOpen source

    92.0score
    Visit Alternatives
  2. 2

    Tuta

    Has a free option; is open source; also runs on iOS, Android, Windows. End-to-end encrypted mail and calendar on a free plan with post-quantum encryption, open-source clients under GPLv3 and servers in Germany. The free plan has only 1 GB of storage.

    Best for Encrypted email and calendar on a free plan

    WebiOSAndroidWindowsmacOSLinuxFree plan, paid upgradesOpen source

    90.0score
    Visit Alternatives
  3. 3

    Mailfence

    Has a free option; also runs on iOS, Android. OpenPGP encryption in the browser and a free plan with 1 GB, under Belgian privacy law. It needs OpenPGP key management, which adds setup that Proton and Tuta do not need.

    Best for OpenPGP email in the browser with a free plan

    WebiOSAndroidFree plan, paid upgrades

    86.5score
    Visit Alternatives
  4. 4

    Posteo

    An ad-free account from 1 euro a month, with anonymous registration and optional encryption of stored data. The site lists no free plan, and only the web platform is listed.

    Best for Ad-free, low-cost email with anonymous sign-up

    WebSubscription

    84.5score
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  5. 5

    Runbox

    Norwegian hosting under Norwegian privacy law, browser PGP compatibility and renewable electricity. It has no free plan after the 30-day trial and lists only the web platform.

    Best for Norway-hosted email with PGP compatibility

    WebSubscription

    83.0score
    Visit Alternatives

Narrow the alternatives

Free alternatives to mailbox.org

Open-source alternatives to mailbox.org

mailbox.org alternatives for Linux

mailbox.org alternatives for Windows

mailbox.org alternatives for macOS

mailbox.org alternatives for Android

mailbox.org alternatives for iOS

About mailbox.org alternatives

What is the best alternative to mailbox.org?
On listme.name the highest-scored alternative is Proton Mail, followed by Tuta. The right choice depends on price, platform and whether you need open source.
Is there a free alternative to mailbox.org?
Yes. Free options include Proton Mail, Tuta, Mailfence.