If you configure the email client via IMAP connection all emails deleted on Thunderbird will be deleted on the server as soon as you close Thunderbird. Therefore, if you are using the IMAP protocol, this article does not concern you. If you are using pop3, you can limit retention on the server.
Is your mailbox already full? Then first delete redundant emails via webmail
Follow these steps in Thunderbird
- Follow right click on your email address to your left.
- Choose ‘Settings’.
- Click on ‘Server Settings’ from the menu to your left.
- Customize the ‘Leave Messages On Server’ option.
- Click on ‘OK’.