Configuring the Bridge to work with Thunderbird can be done in a few steps, outlined below:
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1. Account Settings
2. Add Mail Account
4. Custom Domains
5. IMAP Exception
7. Account Settings
8. Copies & Folders
9. Junk Settings
10. First Message
11. SMTP Exception
12. Addresses 1
13. Addresses 2
14. Addresses 3
15. Addresses 4
To configure the bridge with Thunderbird, first open the application and right-click in the sidebar. Choose Settings.
In the drop-down menu in the bottom left corner select Add Mail Account
Enter your name as well as the email address and bridge password from your bridge account settings screen. The rest of the configuration (security settings, ports, etc.) should be automatically filled in. Then, press Done.
Note: The password you must use is automatically generated from the bridge. Do not use your Login or Mailbox password.
The password generated by the Bridge app can be found by by clicking on Mailbox configuration under your account username.
Custom domain email addresses can be added to the bridge as well, but need extra configuration to work.
When you enter credentials for a custom domain, Thunderbird will give you an warning: Thunderbird failed to find the settings for your email account.. This is normal and expected.
Enter your settings manually as shown above and click Done.
You will be asked to confirm a security exception for port 1143 on 127.0.0.1. This is your localhost, which means that the certificate that we provide must be self-signed and therefore not trusted by default in Thunderbird.
Your newly added account will fetch your emails within 5 minutes. You can send emails without any delay. You can now proceed with configuring your Account settings on the next slide.
Thunderbird requires configuring your draft settings manually. Click the Tools menu (top of the screen) and select "Account Settings".
Choose the "Copies & Folders" menu on the left and scroll down to the "Drafts and Templates" section. Make sure that drafts are kept on the Local Folders. (Some Thunderbird setups won't be called Local Folders, but whatever your default account name is).
Note: Drafts are saved on your local device only. If you create a draft in Thunderbird on your laptop it will only be saved and accessible on that device.
If you would like to disable your client spam filters and rely soley on your ProtonMail spam filters make sure nothing is checked for Junk Settings.
However, keeping your client’s spam filters enabled will offer the advantage of additional spam filtering that is able to utilize the text of all of your messages and will add detected spam senders to your ProtonMail blacklist.
When you send your first message, you may see a Send Message Error. Press OK. This means that you will need to confirm a security exception for port 1025, used for the SMTP server.
You will be asked to confirm a security exception for port 1025 on 127.0.0.1. This is your localhost, which means that the certificate that we provide must be self-signed and therefore not trusted by default in Thunderbird.
Note: In separate addresses mode every IMAP account that you set up with the Bridge is address-specific, and will only be able to send/receive emails from the address it is set up with. You can add any number of addresses to Thunderbird but wait for one address to download before adding another.
If you are in combined address mode, you will have to add your non-primary addresses to Thunderbird if you would like to send with them.
To add an Address, right-click on the Account name in the sidebar and choose Settings.
Click Manage Identities... then the Add button.
Enter your Name and Email Address and click OK.
Success! Thunderbird is now ready to use the Bridge!