When I joined up and doing what I needed to do I noticed there was no check box for members be allowed to send email to each other. Did I miss it or is it just not needed ???? It always been there on all the forums I belong to ???
You didn't miss it. The site doesn't have it, and it's not really needed anyway. There is private messaging on the forum as well as the capability of leaving visitor messages on a particular user's profile. I don't know what forums you frequent, but out of the multitude of forums I am a member of, I know of exactly one site (a GPS enthusiast site) that allows users to email each other.
@cali: the General Settings "Receive Email" options only apply to messages from Admin and friendship requests. What the OP is looking to do is send emails to users through the site rather than private messages, using a messaging page set up by the site for the purpose.