Posteo vs Firefox Relay
Posteo wins on privacy, they tie on price and Posteo wins on features. Every fact below was checked on or before 25 October 2026.
Posteo or Firefox Relay: which should you choose?
- Posteo is the better pick if you want your email to stay in Germany; more space for your mail: 4 GB; and to read your mail in any app, such as Apple Mail, Outlook or Thunderbird.
- Firefox Relay is the better pick if you want to pay less: $0.99 a month and to try it free first.
| Feature | Posteo | Firefox Relay |
|---|---|---|
| Overall | 4.5 | 2.5 |
| Privacy | 4.5 | 1.0 |
| Price | 5.0 | 5.0 |
| Features | 3.0 | Not rated |
| Cheapest plan | Posteo €1 a month | Premium $0.99 a month |
| Free plan | No | Yes, 5 aliases |
| Storage | 4 GB | Forwards only |
| Your own domain | No | Own subdomain only |
| End-to-end encryption | Optional (PGP or encrypted storage) | No |
| Company based in | Germany | United States (Mozilla) |
| Your data is kept in | Germany | United States |
| Founded | 2009 | 2020 |
| Free trial | No, €1 a month from the start | 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 (posteo.de only) | Unlimited aliases |
| Open-source apps | ✓ Yes | ✓ Yes |
| Sign up without ID | ✓ Yes | No |
| White label | No | No |
| Reader offer | None | None |
| Last checked | 22 October 2026 | 25 October 2026 |
Want to add another? Open this in the compare tool.
Where they differ
- Cheapest plans: Posteo Posteo, €1 a month. Firefox Relay Premium, $0.99 a month.
- For free, Posteo gives you no free plan, and Firefox Relay a free plan (5 aliases).
- Posteo comes with 4 GB of storage and Firefox Relay with no storage, as it forwards mail on.
- Data location: Germany for Posteo, United States for Firefox Relay.
- Posteo is based in Germany and Firefox Relay in the United States (Mozilla), so different privacy laws apply.
- Posteo offers optional encryption (PGP or encrypted storage); Firefox Relay doesn't encrypt mail end to end.
- Posteo works in any mail app over IMAP, and Firefox Relay only works in its own apps.
- For extra addresses, Posteo has yes (posteo.de only) and Firefox Relay has unlimited aliases.
Questions people ask
Which is more private, Posteo or Firefox Relay?
Posteo scores 4.5 out of 5 for privacy and Firefox Relay 1. Posteo gives you your email to stay in Germany and an account that doesn't need your phone number or ID.
Which is cheaper, Posteo or Firefox Relay?
Firefox Relay is cheaper. Its Premium plan is $0.99 a month, against €1 a month for Posteo's Posteo. Firefox Relay also has a free plan. Check the renewal price before you pay, as some first-year prices go up.
Do Posteo and Firefox Relay work with my own domain?
No, neither lets you use your own domain, so your address stays on theirs.
Where do Posteo and Firefox Relay keep my email?
Posteo keeps it in Germany. Firefox Relay keeps it in the United States.
Do Posteo and Firefox Relay work in other mail apps?
Posteo works in any mail app over IMAP. Firefox Relay only works in its own apps.
Price changes and news
No price changes for either since 22 October 2026. I check regularly and add any change here with its date.
The latest headlines: Posteo news · Firefox Relay news.
Alternatives to Posteo and Firefox Relay
Posteo vs mailbox.org · Firefox Relay vs mailbox.org · Posteo vs Proton Mail · Firefox Relay vs Proton Mail · Posteo vs Tuta · Firefox Relay vs Tuta
Moving your email
Moving to Posteo · Moving from Posteo. Or see all my switching guides.