When I send emails using PHP's mail() function from my web app I can deliver e-mails successfully to any e-mail address except to my own Google Apps e-mail account, which happens to be on the same domain the web app is on.
I've read http://www.google.com/support/a/bin/answer.py?hl=en&answer=55299 which seems to be my problem, but I don't understand what it's telling me to do. I've also looked at http://forums.cpanel.net/f43/google-apps-mail-problem-139337.html but I'm not sure if that's specific to cpanel or not.
I'm on a VPS with Ubuntu 8.04 Hardy Herron.
Any help would be appreciated, thanks!