Firefox Relay vs Mailu
In short: Firefox Relay wins on privacy, Firefox Relay wins on price, and they tie on features. The full comparison is below, last checked 25 October 2026.
Which should you choose?
- Mailu suits you best if you want an address on your own domain and the choice of any mail app over IMAP.
| Feature | Firefox Relay | Mailu |
|---|---|---|
| Overall | 2.5 | Not rated |
| Privacy | 1.0 | Not rated |
| Price | 5.0 | Not rated |
| Features | Not rated | Not rated |
| Cheapest plan | Premium $0.99 a month | Open source Free |
| Free plan | Yes, 5 aliases | Yes, open source |
| Storage | Forwards only | Not confirmed |
| Your own domain | Own subdomain only | ✓ Yes |
| End-to-end encryption | No | No |
| Company based in | United States (Mozilla) | Not confirmed |
| Your data is kept in | United States | Your own server |
| Founded | 2020 | Unknown |
| Free trial | Free plan | Free to download |
| Funded by advertising | No | No |
| Works in any mail app | No, its own apps only | ✓ IMAP and SMTP |
| Calendar and contacts | No | No |
| Aliases | Unlimited aliases | Yes |
| Open-source apps | ✓ Yes | ✓ Yes |
| Sign up without ID | No | No |
| White label | No | Unknown |
| Reader offer | None | None |
| Last checked | 25 October 2026 | 25 October 2026 |
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The key differences
- Cheapest plans: Firefox Relay Premium, $0.99 a month. Mailu Open source, Free.
- For free, Firefox Relay gives you a free plan (5 aliases), and Mailu a free plan (open source).
- Firefox Relay comes with no storage, as it forwards mail on and Mailu with storage not confirmed.
- Firefox Relay keeps your mail in the United States, while Mailu keeps it in Your own server.
- Firefox Relay is based in the United States (Mozilla) and Mailu in Not confirmed, so different privacy laws apply.
- Mailu lets you bring your own domain name; Firefox Relay doesn't.
- Firefox Relay only works in its own apps, and Mailu works in any mail app over IMAP.
- For extra addresses, Firefox Relay has unlimited aliases and Mailu has yes.
Firefox Relay and Mailu: your questions
Do Firefox Relay and Mailu work with my own domain?
Only Mailu does (Yes). With Firefox Relay your address stays on its own domain.
Where do Firefox Relay and Mailu keep my email?
Firefox Relay keeps it in the United States. Mailu keeps it in Your own server.
Do Firefox Relay and Mailu work in other mail apps?
Firefox Relay only works in its own apps. Mailu works in any mail app over IMAP.
Price changes and news
Neither price has changed since my first check on 25 October 2026.
The latest headlines: Firefox Relay news · Mailu news.
Not sold on either? Try these
Firefox Relay vs Proton Mail · Mailu vs Proton Mail · Firefox Relay vs Tuta · Mailu vs Tuta · Firefox Relay vs mailbox.org · Mailu vs mailbox.org
Switching between them
Whichever you choose, the move follows the same steps. Pick your two providers for the steps.