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Posteo alternatives · Email

Self-hosted alternatives to Posteo

The Posteo listing does not say it can be self-hosted. 6 of the 73 other email apps in this directory can be self-hosted, according to their own sites.

Posteo is a paid product, starting at €1 per month, prepaid (minimum top-up €12). 4 of them are free or have a free plan.

6 tools · Listings checked up to Nov 12, 2026 · Where the facts come from

How each one differs from Posteo

  1. Zimbra

    Self-hosted email, calendar and file sharing for organizations

    • Only Zimbra lists Windows, macOS, Linux, iOS and Android apps.
    • Zimbra is self-hostable, according to its own site.
    • Posteo is end-to-end encrypted, according to its own site.
    • Zimbra also covers tasks.
    Zimbra pricing and details

  2. Inbox Zero

    Open source AI email assistant for Gmail and Outlook

    • Inbox Zero starts at $18 per user / month, billed annually ($20 billed monthly). Posteo starts at €1 per month, prepaid (minimum top-up €12).
    • Only Inbox Zero lists macOS, Windows, iOS and Android apps.
    • Only Inbox Zero lists a browser extension.
    • Inbox Zero is self-hostable, according to its own site.
    Inbox Zero pricing and details

  3. Zero Mail

    Open-source AI email client that connects your existing inboxes

    • Zero Mail starts at $20 per month (billing basis not shown). Posteo starts at €1 per month, prepaid (minimum top-up €12).
    • Zero Mail has a free plan. Posteo does not.
    • Zero Mail is self-hostable, according to its own site.
    • Posteo is end-to-end encrypted, according to its own site.
    Zero Mail pricing and details

  4. Roundcube

    Free open-source webmail client you host yourself

    • Roundcube is free. Posteo starts at €1 per month, prepaid (minimum top-up €12).
    • Roundcube has a free plan. Posteo does not.
    • Roundcube is self-hostable, according to its own site.
    • Posteo is end-to-end encrypted, according to its own site.
    Roundcube pricing and details

  5. SimpleLogin

    Open-source email aliases that forward to your own inbox

    • SimpleLogin starts at $36 per year ($4 billed monthly). Posteo starts at €1 per month, prepaid (minimum top-up €12).
    • SimpleLogin has a free plan. Posteo does not.
    • Only SimpleLogin lists iOS and Android apps.
    • Only SimpleLogin lists a browser extension.
    SimpleLogin pricing and details

  6. addy.io

    Email alias forwarding that hides your real address from sites

    • addy.io starts at $1 per month, billed yearly (Lite). Posteo starts at €1 per month, prepaid (minimum top-up €12).
    • addy.io has a free plan. Posteo does not.
    • Only addy.io lists iOS and Android apps.
    • Only addy.io lists a browser extension.
    addy.io pricing and details

Common questions

Is there a self-hosted alternative to Posteo?

Yes. Zimbra, Inbox Zero, Zero Mail, Roundcube, SimpleLogin and addy.io can be self-hosted, according to their own sites.

Can Posteo be self-hosted?

The Posteo listing does not say it can be self-hosted. The listing was checked on Oct 6, 2026 against the pages it cites.

Which of these email apps are free?

Zero Mail, Roundcube, SimpleLogin and addy.io are free or have a free plan.

When was this checked?

Each listing shows its own date. On this page they run from Oct 6, 2026 to Nov 12, 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 Posteo: the alternatives its listing names first, then the tools that share the most features with it.