Configuring Internal Mail Hosts/Outbound Mail Proxy

Note These steps are only required if your organization has outbound mail relays (internal mail hosts) located between the Email Appliance and the internet. If not, you can clear this task and proceed to the Trusted Relays task.

Organizations with more complex email architectures may also require a more advanced internal mail hosts configuration. These organizations may have internal mail hosts between the Email Appliance and the internet. Settings for these outbound relays and the proxy are configured on the Routing: Internal Mail Hosts page.

If your organization routes all outgoing mail through a proxy server, you must also specify the hostname and port of that server on the Routing: Outbound Mail Proxy page.

  1. To configure the internal mail host(s):
    1. On the Quick Tasks sidebar of the Configuration Homepage, click Internal Mail Hosts. The Routing: Internal Mail Hosts page is displayed.
    2. In the Internal mail hosts text box, enter the fully qualified hostname or IP address of each machine approved to send email from your organization. Click Add after each entry.
  2. [Optional] To configure a proxy server:
    1. On the Quick Tasks sidebar of the Configuration Homepage, click Mail Proxy. The Routing: Outbound Mail Proxy page is displayed.
    2. In the Hostname text box, enter the hostname or IP address, and specify the Port.
    3. In the DNS type drop-down list, select either MX or A.
      Note DNS A records are used for looking up hosts for most types of network connections (HTTP, FTP, etc). MX records are used specifically for email routing and can be used to specify multiple hosts (for example, for failover or load-balancing behavior). If the mail delivery server does not have an MX record in DNS, set DNS Type to A.
    4. [Optional] Select Enforce TLS if the proxy server requires connection via TLS.
    5. [Optional] Select Authenticate using the following credentials if the proxy server requires a username/password for authentication. If a username/password is required, it is strongly recommended that you select the check box described in step 5 (Enforce TLS). Without TLS enforcement, the information will be sent as plain text.
    6. Click Apply.
  3. On the Navigation bar, click the Configuration button.
    You are returned to the Configuration Homepage.
  4. Click the 'x' button to the right of Internal Mail Hosts and Mail Proxy.
    You are now ready to proceed to the Trusted Relays task.