1. create a feedback page. on that page, have some information about contacting you via a separate email address address for contacting you. "contactus@EXAMPLE.com"
2. in the forum settings, choose Contact Link Type as "Contact URL" which points to that page described in step 1.
3. change the forum email to no-reply@EXAMPLE.com. setup that email address to bounce back anything it receives.
Now anything that is sent from the forum will be returned. This is basically a "do not reply directly to this email. it is not monitored."
Keep using your forum user profile account email address as you've always used. if you send anything to a user via the "Send Email" in the Control Panel, you should include the email which address which you want the recipient to reply to, since obviously they are getting an email sent from a send-only account (no-reply@EXAMPLE.com)
