I'm trying to see what the most cost effective way of doing this is. I basically want to separate our business IP and our mail IP's. So if I'm browsing the internet I have the regular IP that Comcast sets us up with. If I am doing any emails, basically having one computer that runs off a different IP address. So when we send emails from that computer it would have the different IP address. Anyone have an ideas or suggestions? I want to do it in the most safe and legal way possible.
If you're on a LAN with the machine you want to send mail from, you can set up one of many free VPN solutions and access the computer that way. I think if you're using a remote mail server, it will show it's IP address, and not the IP of your computer. If not, I'm sure there would be a way to configure it so this was the case.
Use Gmail or Google Apps if you are using your own domain, it does not show the IP Address Of Email Originator http://mail.google.com/support/bin/answer.py?hl=en&answer=26903