Thanks for your reply Till.
What I did is delete my hostname from my site and now I can't get it back.
I had to add (www) to example.com in the Vhosts_ispconfig.conf to fix my problem
I have an empty host in the co-domains but I am still getting
nate@www.example.com. It was something I did because it used to assign
user@example.com.
I tried deleteing
www.example.com from the local-host-names but when I create a new email it puts it right back.