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Chapter 43 System
ZyWALL USG 100/200 Series User’s Guide
675
The following table describes the labels in this screen.
43.5.8 MX Record
A MX (Mail eXchange) record indicates which host is responsible for the mail for a particular
domain, that is, controls where mail is sent for that domain. If you do not configure proper MX
records for your domain or other domain, external e-mail from other mail servers will not be
able to be delivered to your mail server and vice versa. Each host or domain can have only one
MX record, that is, one domain is mapping to one host.
43.5.9 Adding a MX Record
Click the Add icon in the MX Record table to add a MX record.
Figure 493 System > DNS > MX Record Add
The following table describes the labels in this screen.
Table 235 System > DNS > Domain Zone Forwarder Add
LABEL DESCRIPTION
Domain Zone A domain zone is a fully qualified domain name without the host. For example,
zyxel.com.tw is the domain zone for the www.zyxel.com.tw fully qualified domain
name. For example, whenever the ZyWALL receives needs to resolve a
zyxel.com.tw domain name, it can send a query to the recorded name server IP
address.
Enter * if all domain zones are served by the specified DNS server(s).
DNS Server
Select DNS Server(s) from ISP if your ISP dynamically assigns DNS server
information. You also need to select an interface through which the ISP provides
the DNS server IP address(es). The interface should be activated and set to be a
DHCP client. The fields below display the (read-only) DNS server IP address(es)
that the ISP assigns. N/A displays for any DNS server IP address fields for which
the ISP does not assign an IP address.
Select Public DNS Server if you have the IP address of a DNS server. Enter the
DNS server's IP address in the field to the right. The ZyWALL must be able to
connect to the DNS server without using a VPN tunnel. The DNS server could be
on the Internet or one of the ZyWALL’s local networks. You cannot use 0.0.0.0.
Select Private DNS Server if you have the IP address of a DNS server to which
the ZyWALL connects through a VPN tunnel. Enter the DNS server's IP address in
the field to the right. You cannot use 0.0.0.0.
OK Click OK to save your customized settings and exit this screen.
Cancel Click Cancel to exit this screen without saving
Table 236 System > DNS > MX Record Add
LABEL DESCRIPTION
Domain Name Enter the domain name where the mail is destined for.
IP Address/FQDN Enter the IP address or fully qualified domain name of a mail server that handles
the mail for the domain specified in the field above.