Fix slowness, crashing, error messages and other problems

Troubleshoot error messages on Thunderbird.

  • Fix problems with email providers (gmail, Yahoo, etc.) Learn how to fix problems with Gmail, Yahoo and other email providers
  • Cannot delete messages This article explains how to fix issues with message deletion caused by a corrupted trash folder.
  • Avoiding Quota Limits on Mail Servers This article explains how you can keep your mail server under your storage's limit and what you can do if you get a warning like "over quota", "quota exceeded" or "mailbox for user is full".
  • Why does Thunderbird warn me that my server doesn't use encryption? This article explains why Thunderbird displays a warning if you set up an account which doesn't use encryption in order to protect your connection.
  • Sending and Receiving Messages on Thunderbird This article explains the sending and receiving functions in Thunderbird.
  • Cannot receive messages Troubleshooting information for if you are having problems receiving messages.
  • FAQ Changing IMAP to POP As of Thunderbird 3, the new [[Automatic Account Configuration]] Wizard can help you configure your connection to your email provider, but only if your provider is in Mozilla's database of Internet Service Providers or recognized by Thunderbird. While most of the large providers are included, many smaller ones are not yet in the account configuration database. If your mail server supports both IMAP and POP, Thunderbird will use IMAP by default. POP is also supported but must be manually configured using the following instructions
  • Configuring Email Aliases Instructions for configuring email aliases in Thunderbird using filters and identities
  • Rebuilding the Global Database The Global Database, Gloda for short, is part of the indexing system that enables the search function. Rebuilding the Global Database will initiate a re-indexing of emails and address book cards (newsgroup messages are not indexed).
  • Safe Mode Thunderbird Thunderbird's Safe Mode is used for troubleshooting and fixing problems. We'll explain how to get into Safe Mode and what the various options do.
  • Plugin Crash Reports TB This article describes what happens when a Thunderbird plugin (such as Adobe's Flash player) crashes, and how Thunderbird crash reports are handled.
  • ISP Database Thunderbird uses automatic configuration of the connection to mail servers. This article shows how to add ISP configuration data to the database.
  • Thunderbird can't be opened after you install it on a Mac - How to fix How to install Thunderbird on your Mac when you see this error: "Thunderbird can't be opened because the identity of the developer cannot be confirmed."
  • Mozilla Crash Reporter TB The Mozilla Crash Reporter sends crash information to a collection system when Thunderbird crashes. Thunderbird developers use this information to make future versions of Thunderbird crash less frequently.
  • Small Resolution Screens Smaller devices (such as netbook and notepad computers) often have a screen resolution of 1024 x 600 or less. Thunderbird is not yet optimized to display at this resolution.