Zimbra and DNS

[TechSupp]

Just started looking at installing Zimbra fro internal email only and according to the instructions I am following I need an entry in DNS for my Ubuntu PC which is called mail.balby.sch with a static IP of xx.xx.xx.75.

WE have DNS set up on our Server 2003, anyone give me some quick instructions how to add it in the DNS as never entered the DNS management before and don't really want to mess things up :-)
Do I just enter a new DNS(A) record in the port forwarding area and give it the Ubunto's static address? (see I have done a little reading so far but just want to double check it with you guys first.
Apparently needs an MX record as well or is this the same as adding an entry into the DNS?

[Geoff]

You are correct. Just add an A record and type in the info. Same thing for the MX record.

[TechSupp]

Thanks, just not having a great deal of experience (read none) I'm not quite sure how to do it. Just read that as I only want internal email I don't need to set an MX record. Can I set it using the following as found on the Petri IT Knowledge web site:

Command
Dnscmd server_name /RecordAdd zone_name computer_name A IP_address

Dnscmd mail /RecordAdd mail.balby.sch mail A xx.xx.xx.75

or would it be better to go via the dns gui as the above doesnt seem to say if its forwards or backwards

Sorry if these seem simple questions but we all got to start somewhere.

[DMcCoy]

You can't install Zimbra without an mx record, it checks before installation

[TechSupp]

Thanks, now how do I do it and whats the best way?

[Geoff]

I just use the GUI.