ClOwn Mails is a tool to Cleanup your Own Mails!
ClOwn Mails deletes emails older than a certain date to prevent the email account from running out of storage.
To set up IMAP with your mail client, follow your mail provider's instructions for configuring it with the Thunderbird mail client. Use the provided values for the mail server and port number.
If you're unsure, you can leave the port number at its default value of 993. Be sure that the correct password is used for the corresponding email address.
If you want to retain an email, simply mark it as a "favorite".