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Fastmail alternatives · Email

Self-hosted alternatives to Fastmail

The Fastmail 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.

Fastmail is a paid product with a free trial, starting at $3 per user / month, billed yearly (Basic); Individual is $5, billed yearly. 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 Fastmail

  1. Roundcube

    Free open-source webmail client you host yourself

    • Roundcube is free. Fastmail starts at $3 per user / month, billed yearly (Basic); Individual is $5, billed yearly.
    • Roundcube has a free plan. Fastmail does not, though it has a free trial.
    • Only Fastmail lists Windows, macOS, Linux, iOS and Android apps.
    • Roundcube is open source and self-hostable, according to its own site.
    Roundcube vs FastmailRoundcube pricing and details

  2. Zimbra

    Self-hosted email, calendar and file sharing for organizations

    • Zimbra is open source and self-hostable, according to its own site.
    • Zimbra also covers tasks.
    Zimbra pricing and details

  3. Inbox Zero

    Open source AI email assistant for Gmail and Outlook

    • Inbox Zero starts at $18 per user / month, billed annually ($20 billed monthly). Fastmail starts at $3 per user / month, billed yearly (Basic); Individual is $5, billed yearly.
    • Only Inbox Zero lists a browser extension.
    • Only Fastmail lists a Linux app.
    • Inbox Zero is open source and self-hostable, according to its own site.
    Inbox Zero pricing and details

  4. Zero Mail

    Open-source AI email client that connects your existing inboxes

    • Zero Mail starts at $20 per month (billing basis not shown). Fastmail starts at $3 per user / month, billed yearly (Basic); Individual is $5, billed yearly.
    • Zero Mail has a free plan. Fastmail does not, though it has a free trial.
    • Only Fastmail lists Windows, macOS, Linux, iOS and Android apps.
    • Zero Mail is open source and self-hostable, according to its own site.
    Zero Mail pricing and details

  5. SimpleLogin

    Open-source email aliases that forward to your own inbox

    • SimpleLogin starts at $36 per year ($4 billed monthly). Fastmail starts at $3 per user / month, billed yearly (Basic); Individual is $5, billed yearly.
    • SimpleLogin has a free plan. Fastmail does not, though it has a free trial.
    • Only SimpleLogin lists a browser extension.
    • Only Fastmail lists Windows, macOS and Linux apps.
    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). Fastmail starts at $3 per user / month, billed yearly (Basic); Individual is $5, billed yearly.
    • addy.io has a free plan. Fastmail does not, though it has a free trial.
    • Only addy.io lists a browser extension.
    • Only Fastmail lists Windows, macOS and Linux apps.
    addy.io pricing and details

Common questions

Is there a self-hosted alternative to Fastmail?

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

Can Fastmail be self-hosted?

The Fastmail listing does not say it can be self-hosted. The listing was checked on Oct 5, 2026 against the pages it cites.

Which of these email apps are free?

Roundcube, Zero Mail, 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 5, 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 Fastmail: the alternatives its listing names first, then the tools that share the most features with it.