Fastmail vs Firefox Relay
In short: Fastmail wins on privacy, Firefox Relay wins on price, and Fastmail wins on features. The full comparison is below, last checked 25 October 2026.
Fastmail or Firefox Relay: which should you choose?
- Fastmail is the better pick if you want your mail kept in the EU (Amsterdam) for UK customers, with a US replica and US backups; email at your own domain name; and more space for your mail: 50 GB.
- Choose Firefox Relay if you want a cheaper plan, at $0.99 a month; to try it free first; and open-source apps.
| Feature | Fastmail | Firefox Relay |
|---|---|---|
| Overall | 3.0 | 2.5 |
| Privacy | 2.0 | 1.0 |
| Price | 3.5 | 5.0 |
| Features | 5.0 | Not rated |
| Cheapest plan | Individual $5 a month, yearly | Premium $0.99 a month |
| Free plan | No | Yes, 5 aliases |
| Storage | 50 GB | Forwards only |
| Your own domain | ✓ Yes | 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 | Masked email and aliases | 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 |
Want to add another? Open this in the compare tool.
How Fastmail and Firefox Relay differ
- Fastmail's cheapest plan is Individual ($5 a month, yearly); Firefox Relay's is Premium ($0.99 a month).
- Fastmail has no free plan; Firefox Relay has a free plan (5 aliases).
- Space: Fastmail gives 50 GB of storage, Firefox Relay no storage, as it forwards mail on.
- Fastmail 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.
- The companies sit under different laws: Fastmail in Australia, Firefox Relay in United States (Mozilla).
- You can use your own domain with Fastmail, but not with Firefox Relay.
- Mail apps: Fastmail works in any mail app over IMAP; Firefox Relay only works in its own apps.
- Aliases: Fastmail offers masked email and aliases, Firefox Relay unlimited aliases.
Common questions
Is Fastmail more private than Firefox Relay?
Fastmail scores 2 out of 5 for privacy and Firefox Relay 1. Fastmail gives you your mail kept in the EU (Amsterdam) for UK customers, with a US replica and US backups.
Is Fastmail cheaper than Firefox Relay?
Firefox Relay is cheaper. Its Premium plan is $0.99 a month, against $5 a month, yearly for Fastmail's Individual. Firefox Relay also has a free plan. Check the renewal price before you pay, as some first-year prices go up.
Can I use my own domain with Fastmail or Firefox Relay?
Only Fastmail does (Yes). With Firefox Relay your address stays on its own domain.
Where is my email stored with Fastmail and Firefox Relay?
Fastmail keeps it in the EU (Amsterdam) for UK customers, with a US replica and US backups. Firefox Relay keeps it in the United States.
Can I use Fastmail and Firefox Relay in Apple Mail or Outlook?
Fastmail 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 news · Firefox Relay news.
Not sold on either? Try these
Fastmail vs mailbox.org · Firefox Relay vs mailbox.org · Fastmail vs Posteo · Firefox Relay vs Posteo · Fastmail vs Proton Mail · Firefox Relay vs Proton Mail
Switching between them
Moving to Fastmail · Moving from Fastmail. Or see all my switching guides.