Hello, how do I set up an outgoing mail filter in Thunderbird that is applied '''before''' the email is actually sent? I'm using this to automatically add (varying) Cc/Bcc recipients to the email before sending, depending on the mail account used for sending and the recipient's mail address/domain, change the To address based on some condition, or switch to a different From address based e.g. on contents. As I understand it, TB allows me to apply filters automatically on a mail only '''after''' it has already been sent, which for my use cases is too late. Any ideas? Is there a plugin that does this? Thanks, Christian