Deleting messages in Mozilla Thunderbird does not trash them completely; rather, it marks them as removed and hides them from view. This may speed things up, but these messages still consume hard drive space. Compression is the process of completely deleting these marked messages and freeing up space in your inbox. This is how you compress folders in Mozilla Thunderbird, both manually and automatically via settings.
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How to compress in Thunderbird
Choose File > Compress Folders. If your folders are large and you have deleted many messages since the last compression, this process may take some time.
You can set Mozilla Thunderbird to free up disk space automatically – with or without prompting. Here's how to do it:
Select Thunderbird > Preferences.
