It would help in answering you if you'd tell us what you're using for email. However, I can tell you my solution is to save that photo on my hard drive somewhere and then attach it to the forwarded email.
I often receive emails with photos in the body of the email.
Sometimes I forward them on to other friends.
When I press SEND I get a message that ONE OR MORE OF THE PHOTOS WILL NOT BE SENT (something like that) and the recipient does NOT receive the photos in the body of the email but as an album and slide show option.
Can anyone help me correct this problem which just started by itself (seemingly) a few months ago.