Deleting Messages
How do I disable the ANNOYING message box I get every time I want to send a message to the trash folder. Thunderbird keeps asking me if I want the message deleted to save disk space. This just started in the past week. I want my deleted messages to go to the trash folder and I will manage that folder. I can't seem to find anything in settings that lets me disable this option.
Chosen solution
Check this article to understand what compacting (or purging) is, and why it's needed. http://kb.mozillazine.org/Compacting_folders
Basically it's not about deleting existing messages, but to purge messages you have already deleted but still exist in the mail file(s).
To avoid the prompt in the future, check the box 'Remove message deletions automatically and do not ask me' and press proceed.
Having said that, it's always recommended to create a backup of your Thunderbird profile folder on a regular basis. https://support.mozilla.org/kb/profiles-where-thunderbird-stores-user-data#w_backing-up-a-profile
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Version 91 comes out in several weeks, in which the language of the compact dialog has been greatly improved. When you install version 91, if compact causes problems, please create a new support topic.