I did a new install of FC6 and followed the Perfect FC6 Install guide. After finishing and creating a few websites, mail that was being sent from an external email to [email protected] and all the domains hosted on the server were being bounced back with "Technical details of permanent failure: PERM_FAILURE: SMTP Error (state 9): 554 5.7.1 <[email protected] I looked for answers on the forums and found this: Link Here I then went back to the Perfect FC6 Install instructions and looked for the "virtusertable and local-host-names" edits, but didn't find them in there. 1. Which is correct - to use them or not? 2. Also, I'm still having the error. Thanks.