Setting Up Your Green Party Email In Thunderbird
This guide covers adding your Green Party email to Mozilla Thunderbird. Thunderbird's automatic configuration may partially detect the Stackmail settings, but you should be prepared to enter them manually to make sure everything is correct.
If you have done this before and need the server details, skip to the quick settings reference below.
Setting up on a different device or app?
Quick Settings Reference
| Setting | Value |
|---|---|
| Account type | IMAP (recommended) |
| Incoming server | imap.stackmail.com |
| Incoming port | 993 |
| Incoming encryption | SSL/TLS |
| Outgoing server | smtp.stackmail.com |
| Outgoing port | 465 |
| Outgoing encryption | SSL/TLS |
| Username | Your full email address |
| Authentication | Same credentials for incoming and outgoing |
If you need the full walkthrough, read on.
Before You Start
You will need three things:
- Your Green Party email address (e.g. yourrole@localparty.greenparty.org.uk).
- The password you were given, or that you set through webmail.
- Thunderbird installed on your computer (free from thunderbird.net).
Setting Up Your Email
- Open Thunderbird. If this is your first account, the setup wizard starts automatically. Otherwise, go to Account Settings > Account Actions > Add Mail Account.
- Enter your name, your full Green Party email address, and your password.
- Click Configure manually (do not rely on Thunderbird's auto-detect - it may not find the correct settings).
- Set the incoming server:
a. Protocol: IMAP
b. Server: imap.stackmail.com
c. Port: 993
d. SSL: SSL/TLS
e. Authentication: Normal password - Set the outgoing server:
a. Server: smtp.stackmail.com
b. Port: 465
c. SSL: SSL/TLS
d. Authentication: Normal password - Make sure the username for both incoming and outgoing is your full email address.
- Click Re-test to verify the settings, then click Done.
Tip
If Thunderbird's auto-detect runs and suggests different settings, click Configure manually to override them. The auto-detected port numbers or server addresses may not be correct for Stackmail.
Verifying It Worked
Your Green Party inbox should appear in the sidebar. Thunderbird will download your email headers first, then the full messages. Send a test email to yourself to confirm both sending and receiving work.
Troubleshooting
Thunderbird auto-detects the wrong settings: Click Configure manually and enter the settings from the quick reference table above. Pay particular attention to the ports - Thunderbird sometimes suggests port 143 (unencrypted) instead of 993.
Authentication keeps failing: Confirm the authentication method is set to Normal password for both incoming and outgoing. Thunderbird supports other methods (OAuth, NTLM) that will not work with Stackmail.
Can receive but cannot send: Check that the outgoing server is smtp.stackmail.com on port 465 with SSL/TLS. Also verify the outgoing authentication is Normal password using the same credentials as incoming.
Certificate warning: If you see a certificate mismatch, you can add a permanent exception. Go to Settings > Privacy & Security > Certificates > Manage Certificates to review stored exceptions.
If none of these solve it, raise a ticket and include your Thunderbird version and any error messages you see.
Next Steps
Jargon Buster
Changelog
Next Steps
- Accessing Your Green Party Email Through Webmail - check email in a browser
- Setting Up Your Green Party Email In Outlook (Desktop) - if you also want email on your computer
Stuck? Raise a ticket and we will take a look.
As helpful a bunch as we are, sometimes it's worth going straight to the official guides.
Official Thunderbird Guides
Jargon Buster
| Term | Meaning |
|---|---|
| IMAP | Internet Message Access Protocol. Keeps your emails on the server and syncs them across all your devices. The recommended option. |
| POP3 | Post Office Protocol. Downloads emails to one device and (usually) removes them from the server. Not recommended unless you have a specific reason. |
| SMTP | Simple Mail Transfer Protocol. The system used for sending outgoing email. |
| SSL/TLS | Encryption that protects your email data in transit between your computer and the server. |
| Stackmail | The email hosting service used by the Green Party, provided by 20i. |
Changelog
| Date | Change |
|---|---|
| June 2026 | Article published. Covers Thunderbird on Windows, Mac, and Linux. |
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