How can I view an email in plain text?

Hi,

I get email that is in rich text, which is fine. However there are times when I need to view it in plain text for things like copy and paste. I cannot find any view setting that will allow me to switch back and for between the two. I believe this was possible with Snow Leopard. I know it's possible in Thunderbird.

Can this be done with Mac Mail?

Thank you

James