I am looking to make a new Exchange Server to handle all my email that is currently managed by my ISP via POP accounts. I do not have a static public IP. What is the best way to handle and route all mail to X@xxxxxxxxxx without a static IP? Is it possible to have an external SMTP server / sevice via ISP or other source and have my Exchange Server connect to this server and pull in all mail? I currently have my domains website hosted via a service provider so I do not want to modify my domains public IP and bring down my website. Thank you for your suggestions in this matter.