Alright, it worked with plain text for now. I've gotta figure out how to point folks back to their UserCP for convenience. But, at least I have something in the email now. :up:
Code:
$VMEN_message = 'You have a new profile message at http://www.MagicThemeParks.com/mk/forum from ' . $vbulletin->userinfo['username'] . "\n\r" . "\n\r" . 'Thanks!' . "\n\r" . "\n\r" . 'To Opt-Out of these emails, simply edit your details under the UserCP link.';