Issue

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

Solution

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

Summary:

- 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.