Setting an Outbound Mail Proxy

On the Configuration > Routing > Outbound Mail Proxy page, set the proxy server the Email Appliance will use to relay outbound mail to the internet. Optionally, you can use Transport Layer Security (TLS) to enforce a secure connection between the appliance and the mail proxy. You can also authenticate with a username and password if the proxy server requires them.

  1. Select Use outbound mail proxy to enable routing via a proxy server.
  2. In the Hostname text box, enter the IP address or hostname of the mail proxy.
  3. In the Port text box, enter the port on which the server is listening for SMTP connections.
  4. 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). If the mail delivery server does not have an MX record in DNS, set DNS Type to A.
  5. [Optional] Select Enforce TLS if the proxy server requires connection via TLS.
  6. [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.
  7. Click Apply.