I have setup a DNS server outside the firewall that all websites point to from registrar. I then have all MX records pointing to one IP behind my firwall for six sites. This is an ISPConfig address. My question is: Can ISP Config be set up to deliver all mail, for multiple sites incoming on one IP, to each respected mail box? ie mail delivered to either email@example.com or joe@example 2.com, would deliver to the same mail box, web1_joe. I'm trying come up with a way to prevend users of multiple domains from needing to manage multiple accounts with an e-mail client. I did this in the past with virtual user table. I looked like this. firstname.lastname@example.org web1_joe joe@example 2.com web1_joe Will I break ISPConfig if I do this above the line that says: #### MAKE MANUAL ENTRIES BELOW THIS LINE! #### What is the best way to handle this if it is possible. Many thanks for your help.