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Thunderbird STAT Command Did Not Succeed Server Error [Fixed]

By Admin

Updated: April 14, 2026 ~ 5 Minutes Reading

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Many users with Linux and Windows devices get the “STAT command did not succeed server” error in Thunderbird. It leads to Thunderbird not receiving emails, an error fetching the mailbox size, and the number of emails. This guide elaborates on what the Thunderbird STAT common error is, its causes, and its fixes, whether you get it with POP accounts or Gmail, Yahoo, or other IMAP accounts.

What is the STAT Command Did Not Succeed Error in Thunderbird?

Thunderbird STAT Command Did Not Succeed Server Error with IMAP Account -GMAIL

STAT refers to the term “Status” in technical terms. It is the first command used to connect to the POP3 server. When you press the “Get Message” button or restart Thunderbird, it fetches details such as mailbox status, number of emails, and total size of emails.

Thunderbird STAT command error is mostly associated with users with POP3 (Post Office Protocol) accounts when the server returns incorrect values.

Can I Still Get the Thunderbird STAT Command Error with IMAP?

Many old Thunderbird versions also result in the STAT command error with Gmail, Office 365, and Outlook.com errors. Below are the common reasons why you receive this issue in the POP or IMAP account.

Main Causes of Thunderbird STAT Command Error

  • Incorrect port settings or configuration details
  • Firewall, antivirus, or proxy blocking
  • The POP server is down, or POP is disabled
  • Thunderbird is using an old cached password or authentication token

If you get Thunderbird alerts: the STAT command did not succeed with IMAP accounts such as Gmail, Yahoo, Outlook.com, etc. It can be due to:

  • IMAP account configured in Thunderbird as a POP account.
  • Certain Add-Ons consider IMAP as POP.

In rare cases, Thunderbird profile corruption can also lead to this issue. Thus, backing up a Thunderbird profile with a POP account is always crucial to avoid data loss.

How to Fix Thunderbird Alert: The STAT Command Did Not Succeed Issue?

Before you proceed with advanced troubleshooting of the Mozilla Thunderbird command STAT error, ensure you verify basic fixes:

  • You are connected to a secure internet connection
  • You are using the latest Thunderbird version
  • Verify if the server is down – contact your email service provider in such a case.

Try to access your email account via webmail or another email client and verify if the issue is on the server’s end or related to Thunderbird.

Fix 1: Switch to Configuration for IMAP Accounts

If you are getting the Thunderbird STAT error with an IMAP account, verify its configuration settings as the alert pops up when POP is being used in the background.

  1. Open Mozilla Thunderbird.
  2. Go to Menu >> Account Settings.
  3. Open the Server Settings tab.
  4. Verify the Server Type.

If it is set to a POP server, you need to remove the email from Thunderbird and reconfigure Thunderbird with the correct IMAP settings.

Fix 2: Verify POP3 Server Settings

  1. Go to your email account.
  2. Right-click and open Settings.
  3. Go to Server Settings.
  4. Ensure the POP port is set to 995 with SSL/TLS encryption.
  5. If not, edit the settings and restart Thunderbird.

Fix 3: Ensure POP is Enabled for Account

If you want to use IMAP with POP settings in such a situation, you need to ensure that POP settings are enabled. If the configuration mismatched, you get the STAT command did not succeed server error.

Fix 4: Update Authentication to OAuth2

Before proceeding with the authentication method change, ensure that you have already updated the saved password in Thunderbird.

  1. Go to Menu >> Account Settings >> Server Settings.
  2. Scroll to Authentication Method.
  3. Switch from Normal Password >> OAuth.

This is because Microsoft and Google consider the older Thunderbird version as “Less Secure Apps.”

If you are using a Normal Password with 2FA enabled, try using an App-Specific password instead.

General Fixes to Resolve Thunderbird STAT Command Error

  • Fix 5: Clear Thunderbird cache. This resolves the Thunderbird STAT command error caused by old cached passwords.
  • Fix 6: Temporarily disable the firewall or emails, remove proxy and antivirus software. These applications consider Thundebird as a third-party app application interfering its connection to the server.
  • Fix 7: Disable Thunderbird Add-On and restore Thunderbird in Safe Mode
  • Fix 8: Even after trying multiple manuals mentioned above, you still receive the STAT Command did not succeed error. The cause of the error is not the server, but the corrupted Thunderbird profile itself. Thus, in such cases, you rebuild the Thunderbird profile & restore Thunderbird backup.

What If Thunderbird STAT Command Error Persists?

If you are not able to resolve the STAT command did not succeed in Thunderbird. It is best to switch Thunderbird to a more stable email client, such as Outlook, or switch Thunderbird to IMAP completely to avoid data loss, for better data safety and ease of email access with advanced features. Thunderbird Migration Tool is the easiest way to move Thunderbird to Gmail, Yahoo, Outlook, and 30+ other services without any data loss in the most secure way.

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