Setting Up Your Green Party Email In Thunderbird

Setting Up Your Green Party Email In Thunderbird

Who This Is For

This guide is for local party officers and volunteers who need to add their Green Party email account to Mozilla Thunderbird on Windows, Mac, or Linux. If you would prefer to use Outlook, see Setting Up Your Green Party Email In Outlook (Desktop) instead.

This article was last updated September 2026. If you think it needs an update let us know by using the feedback buttons at the bottom of the article.

Norm Cassidy Digital Support Manager
Norm Cassidy

This guide covers adding your Green Party email to Mozilla Thunderbird using the current Stackmail settings provided by 20i.
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

SettingValue
Account typeIMAP
Incoming serverimap.stackmail.com
Incoming port993
Incoming connection securitySSL/TLS
Outgoing serversmtp.stackmail.com
Outgoing port587
Outgoing connection securitySTARTTLS
AuthenticationNormal password
UsernameYour full email address
If you need the full walkthrough, read on.

Before You Start

You will need three things:

Setting Up Your Email

  1. Open Thunderbird. If this is your first account, the setup wizard starts automatically. Otherwise, go to Account Settings > Account Actions > Add Mail Account.
  2. Enter your name, your full Green Party email address and your mailbox password.
  3. If Thunderbird finds settings automatically, check them against the details below. If they do not match, click Configure manually.
  4. Set the incoming server:
    a. Protocol: IMAP
    b. Server: imap.stackmail.com
    c. Port: 993
    d. Connection security: SSL/TLS
    e. Authentication method: Normal password
    f. Username: your full email address
  5. Set the outgoing server:
    a. Server: smtp.stackmail.com
    b. Port: 587
    c. Connection security: STARTTLS
    d. Authentication method: Normal password
    e. Username: your full email address
  6. Click Re-test, then click Done.

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 finds different settings: Click Configure manually and enter the settings from the quick reference table.
Authentication keeps failing: Check that the authentication method is Normal password and that the username is your full email address for both incoming and outgoing mail.
Can receive but cannot send: Check that the outgoing server is smtp.stackmail.com, the port is 587 and the connection security is STARTTLS.

If none of these solves it, raise a ticket and include your Thunderbird version and any error messages you see.
Next Steps
Jargon Buster
Changelog
Next Steps
  1. Accessing Your Green Party Email Through Webmail - check email in a browser
  2. 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
TermMeaning
IMAPInternet Message Access Protocol. Keeps your emails on the server and syncs them across all your devices. The recommended option.
POP3Post Office Protocol. Downloads emails to one device and (usually) removes them from the server. Not recommended unless you have a specific reason.
SMTPSimple Mail Transfer Protocol. The system used for sending outgoing email.
SSL/TLSEncryption that protects your email data in transit between your computer and the server.
StackmailThe email hosting service used by the Green Party, provided by 20i.
Changelog
DateChange
September 2026Updated to match 20i's current Thunderbird setup instructions. Formatting fixes for compatibility with the new theme.
June 2026Article published. Covers Thunderbird on Windows, Mac, and Linux.