Posteo vs Proton Mail for Business
They tie on privacy, Posteo wins on price and Proton Mail for Business wins on features. Every fact below was checked on or before 22 October 2026.
Which should you choose?
- Go for Posteo if you'd like a cheaper plan, at €1 a month; to read your mail in any app, such as Apple Mail, Outlook or Thunderbird; and extras such as POP3 as well as CalDAV and CardDAV sync.
- Proton Mail for Business suits you best if you want mail that's encrypted end to end without any setup; an address on your own domain; and more room (15 GB, against 4 GB).
| Feature | Posteo | Proton Mail for Business |
|---|---|---|
| Overall | 4.5 | 4.0 |
| Privacy | 4.5 | 4.5 |
| Price | 5.0 | 2.5 |
| Features | 3.0 | 4.5 |
| Cheapest plan | Posteo €1 a month | Mail Essentials $6.99 per user a month |
| Free plan | No | No |
| Storage | 4 GB | 15 GB |
| Your own domain | No | ✓ 3 |
| End-to-end encryption | Optional (PGP or encrypted storage) | ✓ Built in |
| Company based in | Germany | Switzerland |
| Your data is kept in | Germany | Switzerland |
| Founded | 2009 | 2014 |
| Free trial | No, €1 a month from the start | 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 | Yes (posteo.de only) | Yes |
| Open-source apps | ✓ Yes | ✓ Yes |
| Sign up without ID | ✓ Yes | No |
| White label | No | No |
| Reader offer | None | None |
| Last checked | 22 October 2026 | 22 October 2026 |
Want to add another? Open this in the compare tool.
Where they differ
- On price: Posteo Posteo at €1 a month, against Proton Mail for Business Mail Essentials at $6.99 per user a month.
- Space: Posteo gives 4 GB of storage, Proton Mail for Business 15 GB of storage.
- Data location: Germany for Posteo, Switzerland for Proton Mail for Business.
- The companies sit under different laws: Posteo in Germany, Proton Mail for Business in Switzerland.
- On encryption, Posteo offers optional encryption (PGP or encrypted storage), whereas Proton Mail for Business encrypts mail end to end.
- You can use your own domain with Proton Mail for Business, but not with Posteo.
- Mail apps: Posteo works in any mail app over IMAP; Proton Mail for Business works in other mail apps through Proton Bridge on paid plans.
- Aliases: Posteo offers yes (posteo.de only), Proton Mail for Business yes.
Questions people ask
Is Posteo more private than Proton Mail for Business?
They score the same for privacy: 4.5 out of 5 each. The differences are in the details, such as where your mail is kept (Germany for Posteo, Switzerland for Proton Mail for Business).
Is Posteo cheaper than Proton Mail for Business?
Posteo is cheaper. Its Posteo plan is €1 a month, 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.
Can I use my own domain with Posteo or Proton Mail for Business?
Only Proton Mail for Business does (3 domains on its cheapest plan that allows one). With Posteo your address stays on its own domain.
Where is my email stored with Posteo and Proton Mail for Business?
Posteo keeps it in Germany. Proton Mail for Business keeps it in Switzerland.
Can I use Posteo and Proton Mail for Business in Apple Mail or Outlook?
Posteo works in any mail app over IMAP. Proton Mail for Business works in other mail apps through Proton Bridge on paid plans.
Prices and the latest 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 · Proton Mail for Business news.
Alternatives to Posteo and Proton Mail for Business
Posteo vs mailbox.org · Proton Mail for Business vs mailbox.org · Posteo vs Proton Mail · Proton Mail for Business vs Proton Mail · Posteo vs Tuta · Proton Mail for Business vs Tuta
Moving your email
Moving to Posteo · Moving from Posteo. Or see all my switching guides.