I have a need to determine when I actually opened an incoming e-mail several months ago. I have the e-mail in question in my MacBook (Leopard) Mail file and can easily see when it arrived in my Mail mailbox. The record at Cox (my actual service provider) is long gone.

Does anyone know if it is possible to determine when I first opened the e-mail and, if so, how do I do it? Other discussion groups seem unable to deal with this question, so I thought I'd give FlyerTalkers a try.

Thanks in advance.