I am trying to prevent several users (couple hundred) from sending mail to more than ten people (because of DL abuse). I know I can do this via SMTP VS, account, and local the local user's registry.
All of which won't work since SMTP is all of noting, each account is too time consuming, local registry is too hard to coordiante and implement.
I have delivery restrictions setup on the DLs, but users simply click the plus in Outlook to get around it.
Is there another way?