Fastmail for Business vs Firefox Relay
Fastmail for Business wins on privacy, Firefox Relay wins on price and Fastmail for Business wins on features. Every fact below was checked on or before 25 October 2026.
Fastmail for Business or Firefox Relay: which should you choose?
- Fastmail for Business is the better pick if you want your mail kept in the EU (Amsterdam) for UK customers, with a US replica and US backups; to use your own domain, like you@yourname.co.uk; and more space for your mail: 50 GB.
- Firefox Relay suits you best if you want the lower price ($0.99 a month); a free plan to start on; and apps whose code is public.
| Feature | Fastmail for Business | Firefox Relay |
|---|---|---|
| Overall | 3.0 | 2.5 |
| Privacy | 2.0 | 1.0 |
| Price | 3.5 | 5.0 |
| Features | 5.0 | Not rated |
| Cheapest plan | Standard $5 per user a month ($4.17 yearly) | Premium $0.99 a month |
| Free plan | No | Yes, 5 aliases |
| Storage | 50 GB | Forwards only |
| Your own domain | ✓ Up to 100 | Own subdomain only |
| End-to-end encryption | No | No |
| Company based in | Australia | United States (Mozilla) |
| Your data is kept in | EU (Amsterdam) for UK customers, with a US replica and US backups | United States |
| Founded | 1999 | 2020 |
| Free trial | 30 days free | Free plan |
| Funded by advertising | No | No |
| Works in any mail app | ✓ IMAP and SMTP | No, its own apps only |
| Calendar and contacts | ✓ Yes | No |
| Aliases | Yes | Unlimited aliases |
| 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 | 25 October 2026 |
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The key differences
- On price: Fastmail for Business Standard at $5 per user a month ($4.17 yearly), against Firefox Relay Premium at $0.99 a month.
- For free, Fastmail for Business gives you no free plan, and Firefox Relay a free plan (5 aliases).
- Fastmail for Business comes with 50 GB of storage and Firefox Relay with no storage, as it forwards mail on.
- Fastmail for Business keeps your mail in the EU (Amsterdam) for UK customers, with a US replica and US backups, while Firefox Relay keeps it in the United States.
- Fastmail for Business is based in Australia and Firefox Relay in the United States (Mozilla), so different privacy laws apply.
- Fastmail for Business lets you bring your own domain name; Firefox Relay doesn't.
- Fastmail for Business works in any mail app over IMAP, and Firefox Relay only works in its own apps.
- For extra addresses, Fastmail for Business has yes and Firefox Relay has unlimited aliases.
Questions people ask
Which is more private, Fastmail for Business or Firefox Relay?
Fastmail for Business scores 2 out of 5 for privacy and Firefox Relay 1. Fastmail for Business gives you your mail kept in the EU (Amsterdam) for UK customers, with a US replica and US backups.
Which is cheaper, Fastmail for Business or Firefox Relay?
Firefox Relay is cheaper. Its Premium plan is $0.99 a month, against $5 per user a month ($4.17 yearly) for Fastmail for Business's Standard. Firefox Relay also has a free plan. Check the renewal price before you pay, as some first-year prices go up.
Do Fastmail for Business and Firefox Relay work with my own domain?
Only Fastmail for Business does (Up to 100). With Firefox Relay your address stays on its own domain.
Where do Fastmail for Business and Firefox Relay keep my email?
Fastmail for Business keeps it in the EU (Amsterdam) for UK customers, with a US replica and US backups. Firefox Relay keeps it in the United States.
Do Fastmail for Business and Firefox Relay work in other mail apps?
Fastmail for Business works in any mail app over IMAP. Firefox Relay only works in its own apps.
Recent price changes
No price changes for either since 22 October 2026. I check regularly and add any change here with its date.
The latest headlines: Fastmail for Business news · Firefox Relay news.
Not sold on either? Try these
Fastmail for Business vs mailbox.org · Firefox Relay vs mailbox.org · Fastmail for Business vs Posteo · Firefox Relay vs Posteo · Fastmail for Business vs Proton Mail · Firefox Relay vs Proton Mail
Moving your email
Whichever you choose, the move follows the same steps. Pick your two providers for the steps.