Proton Mail Bridge Cheatsheet
Setup & Configuration

Proton Mail Bridge enables using Proton Mail with desktop email clients.

IMAP/SMTP Settings

Setting Value
IMAP server 127.0.0.1
IMAP port 1143
SMTP server 127.0.0.1
SMTP port 1025
Security STARTTLS
Username Your Proton email
Password Bridge-generated password

Compatible Clients

Client Setup
Apple Mail Auto-configured
Outlook Manual IMAP setup
Thunderbird Manual IMAP setup
Spark Manual IMAP setup
Troubleshooting
Issue Solution
Connection failed Restart Bridge, check ports
Sync slow Clear cache, re-sync
Auth error Regenerate Bridge password
Missing emails Check folder subscriptions
High CPU Update to latest version