Mailbox.org vs Fastmail
Both are alternatives to Gmail. Here's how they stack up — verified facts, no spin.
Also searched as Fastmail vs Mailbox.org — same comparison, one verdict.
Mailbox.org and Fastmail are closely matched on ownership (50 vs 45) — this one comes down to pricing and to which trade-offs below you can live with.
Mailbox.org
German privacy-focused mail with a full office suite — standards-based.
Mailbox.org is a German, privacy-respecting email host for people who want a professional, standards-based inbox (IMAP/SMTP, custom domains) with an integrated office suite and calendar, powered by 100% renewable energy. It offers PGP encryption and an encrypted-mailbox option, but it's a commercial, closed service rather than open-source — the honest “privacy-friendly and full-featured, without encryption-first constraints” pick.
Fastmail
Fast, reliable, standards-based mail — the productivity pick.
Fastmail is a long-running independent email host (Australian) built for speed, reliability, and standards support rather than encryption. It doesn't offer end-to-end encryption, but it doesn't scan your mail, sell your data, or show ads — you're the paying customer, not the product. Excellent custom-domain support, great apps, and best-in-class deliverability make it the honest pick when you want to leave Gmail for independence and quality without the constraints E2E encryption imposes.
Side by side
6 points of comparison, every one read from a verified field. Green marks the side that wins a row outright. A dash means we do not hold that fact — never that it is zero.
| Mailbox.org | Fastmail | |
|---|---|---|
| Sovereignty ScoreOur transparent 0–100 composite for data ownership and exit cost. | 50 | 45 |
| Open source | No | No |
| Self-hostable | No | No |
| Local-first data | No | No |
| License | Proprietary | Proprietary |
| Pricing | From about €1/month (Light) up to office and business tiers; custom domains supported | From about $5/user/month; 30-day free trial; custom domains included |
Mailbox.org edges it on the Sovereignty Score, but the right pick depends on the trade-offs below.
Weighing both against staying on Gmail? Is Gmail free? What it actually costs →
Mailbox.org
Strengths
- +Cheap, standards-based (IMAP/SMTP), custom domains
- +German/EU privacy law; PGP support and an encrypted-mailbox option
- +Integrated calendar, contacts, and office suite
Trade-offs
- −Closed-source, commercial service
- −Not end-to-end by default (PGP is opt-in)
- −Interface is more utilitarian than polished
Fastmail
Strengths
- +Fast and reliable, with excellent IMAP/JMAP standards support
- +No ads and no data selling — you're the customer
- +Superb custom-domain and multi-identity handling
Trade-offs
- −No end-to-end encryption
- −Closed-source, commercial service
- −Australian jurisdiction (Five Eyes) may matter to some
Which one fits you
The trade-offs above, turned into a decision. Find the line that describes your team.
Choose Mailbox.org
if a lower exit cost matters more to you than any single feature, and cheap, standards-based (IMAP/SMTP), custom domains.
Choose Fastmail
if fast and reliable, with excellent IMAP/JMAP standards support.
Neither, yet
if both carry a real cost you should weigh first — closed-source, commercial service, and no end-to-end encryption. If either of those is a dealbreaker for your team, the shortlist is wrong rather than the choice.
Mailbox.org vs Fastmail — common questions
Is Mailbox.org a better fit than Fastmail for email & secure mail?
It depends on what you are optimising for, and the honest split is this: Mailbox.org scores 50 to Fastmail's 45 on data ownership and exit cost, so it is the safer choice if you care about being able to leave. Fastmail earns its place on a different axis — fast and reliable, with excellent IMAP/JMAP standards support. Neither is a wrong answer for every team; the table above is the actual comparison.
What happens if we want to switch later?
Neither of these is local-first by default, so plan the exit at the point you adopt rather than later. Export what matters on a schedule instead of trusting you can retrieve it on demand — that is the most common way a email & secure mail migration turns into a project instead of an afternoon.
Is Fastmail free?
Fastmail: From about $5/user/month; 30-day free trial; custom domains included. The other side of this comparison, Mailbox.org, is priced as From about €1/month (Light) up to office and business tiers; custom domains supported. "Free" here means no licence fee — if you self-host it you still pay for the server, and the running cost row above is our honest estimate of that.
Are Mailbox.org and Fastmail both alternatives to Gmail?
Yes — both appear in our Gmail comparison, which is why they are worth putting side by side. People usually arrive here already having decided to move off Gmail and now choosing between the two replacements, which is a narrower and much easier question.
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Facts verified 2026-07-14. Licenses and pricing change — spotted something out of date? That's a correction we want.