I have multiple domains hosted on a box dedicated for email with ISPConfig 3. I'm noticed that some servers are giving me bounce backs for bad rDNS (didnt think it was going to be an issue) So i have multiple static ips setup with the proper rDNS for each domain. How can i configure postfix to send from there respected IPs per firstname.lastname@example.org for xxx.xxx.xxx.100 email@example.com for xxx.xxx.xxx.101 firstname.lastname@example.org for xxx.xxx.xxx.102 Is this possible with a single server? Server is behind a VPN/Firewall that has All ips routed to the same internal address. (might be an issue not sure) Any input would be awesome. At least something to get me on the right path. Might be possible to push the ips to the server itself if needed for solution. If not ill just have to do some type of VMs inside of a single server might be my only choice. i suppose i could assign mutiple internal IPs to the single ethernet card and bind the ips at the device that way as well. Thanks guys, I 99.9% of i always found an answer by searching the forum. I just didnt see something like this posted. I've been using ispconfig for a few months and its AWESOME!