[ubuntu] Postfix & web front end on separate servers

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http://ubuntuforums.org – I'm fairly new to Ubuntu. Downloaded and installed my first Ubuntu server this week and so far I'm very happy with my decision. I set up a web server and within a very short time I had a WordPress blog up and running. Very easy and straightforward. What I would like to do is install another separate server that will function as an email server. I will probably end up hosting 2-3 domains. I would like to use the already set up and configured web server for the web frontend for email but have a separate server for email. Is this possible? If so, are there any guides for how to do this? (Hardware)