Dear Thunderbird Support Team, I hope this message finds you well. I am writing to inquire about a feature in Thunderbird that I have not been able to set up successfully. I need a way to automatically track sent emails that have not yet received a reply. My goal is to have a folder that dynamically contains all my sent messages that haven't received any response. Once a reply is received, the message should automatically disappear from this folder. Here is a more detailed description of what I am trying to achieve: Sent emails are automatically copied to a specific folder. This folder should only contain sent messages that have not yet been replied to. Once a reply to a sent message is received, the original sent message should automatically be removed from the folder. I have tried using the saved searches feature, but it does not fully meet my needs as it does not dynamically update based on replies received. Is there a way to accomplish this with the current version of Thunderbird, or is there a plugin or extension that you can recommend to achieve this functionality? If this feature is not currently available, I would like to request its consideration for future updates. Thank you for your time and assistance. I look forward to your guidance on how to set up this functionality or any recommendations you may have. Best regards, Chris