no, actually it is FC2, and what is wierd is, that is was working...hmmm.
I added a phpbb site, basicly copied your site for my daughter and started creating email addresses for her friends to send emails to. Once I did that, I started getting the 'user unknown' errors. I haven't had time today to look at it. I will be getting with you soon to help with the upgrades because I found that our two outside mail servers have the sendmail hole and need to be patched. When I tried to do an 'apt-get upgrade' I could not find a Redhat 7.2 distro....(yes they are on RH 7.2) So what the hell, let's upgrade...that is what I always say!! By the way if you want to see my copied site go to http://{mylastname}.homeip.net

It's for my daughter, it was easy, and it was open-source!!!