[cobalt-users] MX Record Setup Question

[Bob G7 <Bob_G7@xxxxxxxxxx>]

Thanks everyone for your help in the past, now on to the next little
problem. I'm trying to get the mail server part working. When I go to add a
MX Record, per the instructions, it says:

Enter host name and domain name you want to serve (for example, www and
mydomain.com) and enter it's IP address (for example 192.168.1.1) and
network mask (for example, 24)

When I go the Add MX Record panel, I have the following options:

Host Name (optional)
Domain Name
Mail Server Name
Delivery Predecence

Where am I supposed to enter the IP Address and Network Mask?

Thanks in advance,
Bob G.