Is it possible to edit the Subject line in an incoming message? Let me explain. I send an email with a Subject line that is relevant to the message. Some weeks or months later, the recipient decides they need to email me about a different subject. Rather than opening a compose window and typing a Subject that is appropriate to the new message, they simply find the old message from me, and click on Reply. So when I receive that reply, it still has the old Subject line. This plays havoc with my filing system, and makes it virtually impossible for me to find the message at a later time. This happens surprisingly often. I know I can select "Edit as new message". This opens the message in a compose window, from where I can edit the Subject. The problem is, when I then save the message, it shows my own email address in the From line rather than that of the person who sent it. This just adds to the difficulty of keeping track of messages. I hope this makes sense. Thanks in advance for your help. Mike P.S. I am using Thunderbird 60.7.0