forwarding emails

I got a email from a car rental agency with the reservation number and dates and times on it, I tried forwarding it to my son and he never got it, so I went home and tried forwarding it to my other email address, I got the email, but it has nothing except the subject, none of the information forwarded. this has happened many times using cox, a lot of times I have to go to work and copy and paste the information and send it from my work computer, why is this happening, when you open up your email you received, you should just be able to forward to anyone you want, even if their is a attachment, and it never works on cox web mail......help. Marie