Thunderbird - Error message: Inbox full

October 2016


I use Thunderbird with a pop mail account. Each time I want to read my new messages, Thunderbird displays an error message: "Inbox full".


This happens when Thunderbird is no longer able to compact your mail folders. The solution is to:
- Move all mails from inbox to another folder (
- Try to compact the inbox
- Close thunderbird
Read this article from Mozilla: Moving your mail storage location
- Go to the directory in which your inbox is located
- If the Inbox file is too large, delete this file (make a backup copy of this file)
- Restart thunderbird
- The inbox file will be re-created and you shall be able to view your new mails.
Thanks to gauthier for this tip.

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