Mx Record; Adding A Mx Record; Security Option Control; Editing A Security Option Control - ZyXEL Communications ZyWALL 110 User Manual

36.6.10 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.

36.6.11 Adding a MX Record

Click the Add icon in the MX Record table to add a MX record.
Figure 460 Configuration > System > DNS > MX Record Add
The following table describes the labels in this screen.
Table 306 Configuration > System > DNS > MX Record Add
LABEL
Domain Name
IP Address/FQDN
OK
Cancel

36.6.12 Security Option Control

Configure the Security Option Control section in the Configuration > System > DNS screen
(click Show Advanced Settings to display it) if you suspect the ZyWALL/USG is being used by
hackers in a DNS amplification attack.
One possible strategy would be to deny Query Recursion and Additional Info from Cache in the
default policy and allow Query Recursion and Additional Info from Cache only from trusted
DNS servers identified by address objects and added as members in the customized policy.

36.6.13 Editing a Security Option Control

Click a control policy and then click Edit to change allow or deny actions for Query Recursion
and Additional Info from Cache.
Chapter 36 System
DESCRIPTION
Enter the domain name where the mail is destined for.
Enter the IP address or Fully-Qualified Domain Name (FQDN) of a mail server that
handles the mail for the domain specified in the field above.
Click OK to save your customized settings and exit this screen.
Click Cancel to exit this screen without saving
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