Why does Thunderbird delete messages from my inbox althoug I have marked never delete in the system?
Thunderbird keeps deleting messages from my inbox, although I have marked never delete in the settings.
Solution choisie
What do you want someone other than you mail provider to do about that? As I said Thunderbird will delete whatever the IMAP server says delete. That is how IMAP works, not just in Thunderbird.
The only way I am aware of that stops that is to move the emails to local folders where the server does not have control.
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Is you account IMAP or POP? If it is IMAP read this. https://support.mozilla.org/en-US/kb/glossary-terms-including-types-accounts#w_mail-accounts
Note the synchronize part and be aware the server is considered a canonical source if there is any conflict over settings. So if the server says delete upon reading that is what will happen.
I have a IMAP account. Messages keep on disappearing after about 14 days. Especially messages that I want to save, like ivoices etc.
Solution choisie
What do you want someone other than you mail provider to do about that? As I said Thunderbird will delete whatever the IMAP server says delete. That is how IMAP works, not just in Thunderbird.
The only way I am aware of that stops that is to move the emails to local folders where the server does not have control.