I have a dedicated server that I plan to use to host multiple web applications for a few different clients. If I have client1.com and client2.com, I would like web apps on those domains to be able to send email from their respective static IP addresses.
But I recently learned this is not possible. I guess you can't pick which IP your email comes FROM. I want to be able to do that so when customers' mail servers perform spam screening, the IP the email came from will match up to client1.com or client2.com, whichever is applicable.
So if I can't pick which IP the email gets sent from, then I guess I need to pay for some service that will allow this.
So I could still have www.client1.com on my own server, but then pay for a service to host mail.client1.com, and send email with their SMTP server. I also need to offer my clients email accounts, so I may as well look for a service that does email both ways, right?
I hope I am making sense here. :)