I'm trying to set up a new machine with Zimbra 3.1 on SUSE Linux. During the installation process I get a warning that my host isn't resolvable to a DNS MX record.

Being new to all this, I ask your patience.

If the DNS entry for my MX record is mail.companyname.com with an IP of 204.68.221.1 (for example), does that mean that I must name my Linux box mail.companyname.com with an IP of 204.68.221.1?

Right now the IP address of my DSL router is the 204.68.221.1. Can't the IP of my Zimbra server be something else (e.g., 192.168.2.100)?

I'm not running my own DNS. I've entered the address of my ISP's DNS server in the configuration on Suse.

So, can I just ignore the warning or do I need to address it?

Thanks!