Fastmail vs Proton Mail for Business
On privacy it's Proton Mail for Business. On price it's Fastmail. On features it's Fastmail. Here's everything side by side, last checked 22 October 2026.
Fastmail or Proton Mail for Business: which should you choose?
- Choose Fastmail if you want a cheaper plan, at $5 a month, yearly; more space for your mail: 50 GB; and to read your mail in any app, such as Apple Mail, Outlook or Thunderbird.
- Go for Proton Mail for Business if you'd like encryption that means even the provider can't read your mail; more built in, including PGP encryption as well as password-protected email to anyone; and open-source apps anyone can check.
| Feature | Fastmail | Proton Mail for Business |
|---|---|---|
| Overall | 3.0 | 4.0 |
| Privacy | 2.0 | 4.5 |
| Price | 3.5 | 2.5 |
| Features | 5.0 | 4.5 |
| Cheapest plan | Individual $5 a month, yearly | Mail Essentials $6.99 per user a month |
| Free plan | No | No |
| Storage | 50 GB | 15 GB |
| Your own domain | ✓ Yes | ✓ 3 |
| End-to-end encryption | No | ✓ Built in |
| Company based in | Australia | Switzerland |
| Your data is kept in | EU (Amsterdam) for UK customers, with a US replica and US backups | Switzerland |
| Founded | 1999 | 2014 |
| Free trial | 30 days free | 30-day refund |
| Funded by advertising | No | No |
| Works in any mail app | ✓ IMAP and SMTP | With Proton Bridge on paid plans |
| Calendar and contacts | ✓ Yes | ✓ Yes |
| Aliases | Masked email and aliases | Yes |
| Open-source apps | No | ✓ Yes |
| Sign up without ID | No | No |
| White label | No | No |
| Reader offer | Offer 10% off your first year, plus a free trial of up to 30 days | None |
| Last checked | 22 October 2026 | 22 October 2026 |
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How Fastmail and Proton Mail for Business differ
- On price: Fastmail Individual at $5 a month, yearly, against Proton Mail for Business Mail Essentials at $6.99 per user a month.
- Fastmail comes with 50 GB of storage and Proton Mail for Business with 15 GB of storage.
- Your mail is stored in the EU (Amsterdam) for UK customers, with a US replica and US backups with Fastmail, and in Switzerland with Proton Mail for Business.
- Fastmail is based in Australia and Proton Mail for Business in Switzerland, so different privacy laws apply.
- Fastmail doesn't encrypt mail end to end; Proton Mail for Business encrypts mail end to end.
- Fastmail works in any mail app over IMAP, and Proton Mail for Business works in other mail apps through Proton Bridge on paid plans.
- For extra addresses, Fastmail has masked email and aliases and Proton Mail for Business has yes.
Fastmail and Proton Mail for Business: your questions
Which is more private, Fastmail or Proton Mail for Business?
Proton Mail for Business scores 4.5 out of 5 for privacy and Fastmail 2. Proton Mail for Business gives you encryption that means even the provider can't read your mail and open-source apps anyone can check.
Which is cheaper, Fastmail or Proton Mail for Business?
Fastmail is cheaper. Its Individual plan is $5 a month, yearly, against $6.99 per user a month for Proton Mail for Business's Mail Essentials. Check the renewal price before you pay, as some first-year prices go up.
Do Fastmail and Proton Mail for Business work with my own domain?
Yes, both do. Fastmail: Yes. Proton Mail for Business: 3 domains on its cheapest plan that allows one.
Where do Fastmail and Proton Mail for Business keep my email?
Fastmail keeps it in the EU (Amsterdam) for UK customers, with a US replica and US backups. Proton Mail for Business keeps it in Switzerland.
Do Fastmail and Proton Mail for Business work in other mail apps?
Fastmail works in any mail app over IMAP. Proton Mail for Business works in other mail apps through Proton Bridge on paid plans.
Price changes and news
I haven't seen either change its price since I started checking on 22 October 2026.
The latest headlines: Fastmail news · Proton Mail for Business news.
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Moving your email
Moving to Fastmail · Moving from Fastmail. Or see all my switching guides.