Rdns email server
I'm a little confused on what a need to do about creating a Rdns for our mail server as aol is rejecting our mail because it has no rdns
Our DNs is held with 1&1 and the setup is the follow
Mx record for ip X.x.x.66 is forwarded to our barracuda
Barracuda passes email on to exchange
Exchange sends messages var the barracuda then barracuda sends that straight to the Internet.
I'm a little unclear how to create a Rdns record or where I have to do this
You create the RDNS record with whoever is providing your public IP addresses to you. You'll need to ask them to set RDNS for x.x.x.66 to the hostname of your server, like mail.school.cty.sch.uk.
In your case you should set your RDNS to the hostname of your Barracuda.