A ZixGateway appliance relies on several resources of its host machine and network. Use the Host System Resources parameters to define the locations of these resources and set up auxiliary domain name mappings for the mail relay.
Host System Resources are:
Optional, User-defined
To ensure that the system clock on a host machine is as accurate as possible, many organizations host a Network Time Protocol (NTP) server within their network. A ZixGateway appliance host machine is able to use an NTP time source if it is available in your network.
Required, User-defined
A Domain Name Server (DNS) is an essential part of any Internet application. It translates Internet domain names to their corresponding IP addresses. These IP addresses are the actual, low-level network addresses used for referring to other email servers, mail relays and network time servers, and for resolving email address domains.
The Domain Name Servers parameter value is a string of IP addresses, separated by commas. Type at least one DNS address in the Domain Name Servers text box.
If you define two or more DNS entries, they will be searched in the order that you enter them whenever a domain name needs to be resolved.
While this parameter appears in ZixGateway Manager, it is not used at this time. Any value entered for this parameter will not affect ZixGateway behavior.
Optional, User-defined
There may be cases where you need to route email messages for Domains or IP Addresses other than those defined in the Domain Name list. For example, all inbound email messages may be routed to ZixGateway, but you do not want all domains to be encryption domains. You may want to route outbound email messages to a VPN or a TLS destination.
Note: If the recipient domain has a TLS policy, Explicit Domain Name Mappings will not be used for that policy.
To do so, enter the values in the Explicit Domain Name Mappings field, separated by a colon in the form of <recipient_domain_name>:<destination_address>. There are three valid formats:
Multiple comma separated entries are allowed.
For example:
marketing.zixcustomer.com:marketing.zixcustomer.com, partner.zixcustomer.com:192.168.12.58, partner.zixcustomer.com:smtp.zixcustomer.com, zixhospital.org:secure.zixhospital.org
This example explicitly maps the addresses of two zixcustomer.com third level domain servers into the ZixGateway appliance. Thus, whenever the ZixGateway appliance attempts to route email messages to these servers, it routes messages to partner.zixcustomer.com and marketing.zixcustomer.com. An outbound email to zixhospital will be routed to secure.zixhospital.org.
Note: <recipient_domain_name>:<IP_address> will not refer to the DNS A- or MX-records.
Optional, Defaulted
Direct shell-level access to a ZixGateway appliance host machine is gained via a secure shell (SSH) session. You use this parameter to inform a ZixGateway appliance which administrative client machines are authorized to open an SSH session with the server and access the ZixGateway Manager.
ZixCorp requires that you configure SSH access for remote access to ZixGateway. If you do not define Allowed Administrative Networks, you can open an SSH session or access the ZixGateway Manager from any client machine. This parameter also restricts SSL access, which is used by ZixGateway Manager to connect to the host ZixGateway appliance.
The format of the value of this parameter is a list of specific machine IDs (IP addresses) or subnet masks (e.g. 134.193.15.0/24), separated by commas. You can authorize several administrative client machines.