[edit]
Works great - thanks LunarTech. Running 3.6.4.
A bit of any unrelated question: when I installed this I was using php mail. I just changed to SMTP mail using -f param Now, the From address is still my default vbulletin admin email, while the "Return-Path" is the vbouncer email. I'm assuming this is correct behavior. But it would be great to not have the default vbulletin admin email as the "from" address though - I always get people replying to post notifications