Start with the right service
Proton Mail’s encrypted design changes the desktop setup process. Ordinary public IMAP settings are not a substitute for Proton Mail Bridge. Mobile access and desktop-client access also use different approaches.
Configuration quick reference
| Reference | What to check |
|---|---|
| Connection and access | Desktop IMAP/SMTP access uses Proton Mail Bridge on eligible paid plans. Proton does not offer POP3 support. |
| Account authority | Use the original provider for identity verification, account recovery, eligibility and billing. |
Official reference: Proton Bridge documentation. Check the provider’s current instructions before changing settings. Reviewed October 14, 2026.
Work through the problem
- Test the mailbox in Proton’s official web app or mobile app.
- For a supported desktop client, confirm your plan includes Proton Mail Bridge and install it only from Proton.
- Use the connection details shown by Bridge on your own computer. Do not reuse another person’s local Bridge credentials.
- If the client disconnects, check Bridge’s connection status before editing the client’s ports.
Keep a useful diagnostic record
Note the exact error, the application and version, and whether the same account works on the provider’s website. Record whether sending, receiving or sign-in fails. Remove private message content from screenshots before sharing them.
If you use POP or local folders, preserve those messages before removing an account. A new account configuration may not recover data stored only on the old device.
Choose your next step
For an app-only problem, compare authorization and settings with the official reference above. For an account restriction or failed identity check, continue with the original provider. Independent assistance cannot bypass these controls.
Related guides: IMAP, POP and SMTP · Password recovery · Email synchronization.