I was able to get my email server working correctly, but I would like to be able to send outgoing email through a specified IP address and Hostname for each specific virtual domain. Right now, all of my email from the virtual domains are being sent via 1 IP and Hostname. I have a feeling that if I decided to go live with this server all of the emails sent via these domains would be tagged as spam or bounced due to incorrect IP address and domain name sender information. What can I do to fix this? Can I create a new column and specify in my MySQL domains table the correct outgoing information for Postfix to use? I can't find any help regarding this.