Proton Mail alternative
The alternative to Proton Mail for businesses.
Proton puts end-to-end encryption at the centre. According to Proton, mail clients connect there through Proton Mail Bridge. Conbool Mail speaks open protocols, so Outlook, Apple Mail, Thunderbird and smartphones connect directly.
- Clients
- Directly via IMAP and ActiveSync
- Mailbox
- 50 GB in Plan 1
- Price
- From €1.29 per mailbox per month, net
Conbool Mail and Proton Mail compared.
| Feature | Conbool Mail | Proton Mail |
|---|---|---|
| Focus | Business mailbox with open protocols | End-to-end encryption between Proton accounts |
| Mailbox | 5, 50 or 100 GB depending on plan | 15 GB per user in Mail Essentials |
| Outlook, Apple Mail, Thunderbird | Directly via IMAP and SMTP | According to Proton via Proton Mail Bridge, in paid plans |
| Provider's seat | Hamburg, Germany | Geneva, Switzerland |
| Price | From €1.29 per mailbox per month, net | See the Proton price list |
Details on Proton Mail according to the provider's public information, as of October 2026. Plans change, the provider's own information is authoritative. All names mentioned are trademarks of their owners.
Proton Mail fits when
- end-to-end encryption between all parties is the key criterion.
- you mostly work with Proton's apps.
- you also use Proton's VPN, password manager and file storage.
Conbool Mail fits when
- Outlook, Apple Mail or Thunderbird should work without extra software.
- smartphones should use Exchange ActiveSync with the built-in mail app.
- you want to handle S/MIME and PGP encryption centrally in the gateway, with SecureMail as a module.
Switching from Proton Mail to Conbool Mail.
The migration runs via IMAP. With Proton, according to the provider, the Proton Mail Bridge application provides access for mail clients.
Questions about the Proton Mail alternative
Is Conbool Mail end-to-end encrypted like Proton Mail?
No, Conbool Mail is a mailbox with open protocols. Messages can be encrypted with S/MIME and PGP, centrally in the gateway through the SecureMail module.
Does Outlook work without extra software?
Yes. Outlook, Apple Mail and Thunderbird connect directly via IMAP and SMTP, with a separate app password per device.
What does Conbool Mail cost compared with Proton Mail?
Conbool Mail costs €1.29 for Kiosk, €2.99 for Plan 1 and €5.49 for Plan 2 per mailbox per month, net. Proton Mail prices are listed in the provider's price list.
Where is the data stored?
With Conbool Mail in data centres in Germany or in your own data centre. Proton is based in Geneva, Switzerland.
Go through the switch with your mailboxes.
We show you Conbool Mail and plan the migration with you.