I had pretty much decided that was the route I would take. However, I plan on using the public IP address that I have as a gateway for several servers, especially considering that ISPConfig3 now manages several servers.
When configuring the reverse DNS, would you recommend using the FQDN of the email server? Or should I use a setup similar to what I used before where the mailname was different than the machine hostname?
I don't want to make things more difficult than they need to be.