IMTA Location Relative to Public Internet

To Configure IMTA Position Relative to the Internet  

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If the IMTA is directly connected to the public internet (such as on a firewall system), it delivers outbound mail by using the domain part (right-hand side) of the envelope recipient in the DNS and routes accordingly. Conversely, if the IMTA is not connected to the public internet, outbound mail for external addresses has to be forwarded to a smart host--an SMTP host which can resolve addresses that the current IMTA cannot resolve.

This section describes how to specify the position of the IMTA relative to the public internet, and how to specify a fully qualified smart host name if the IMTA is not directly connected to the internet. The routing configuration will differ depending on whether the IMTA is or is not connected to the internet. Depending on the position you select, the Admin Server will modify the IMTA rewrite rules to reflect that position.


 

To Configure IMTA Position Relative to the Internet



AdminConsole>IMTA>Position Vs. Firewall  

  1. From the Sections list of the IMTA property book, click on the Position Vs. Firewall.
 

FIGURE  4-7 Position Versus Firewall Section

  2. Determine whether the IMTA is connected directly to the public internet.
  If the IMTA is connected directly to the public internet, select No firewall separates the MTA from the public internet. If the IMTA is not directly connected to the public internet, click The IMTA is separated from the Internet by a firewall system.
  3. If you indicated that a firewall separates the IMTA from the Internet, then specify the smart host name.
  It must be a fully-qualified name. The syntax is mailhost.domain. Enter the name using ASCII characters. The characters are case-sensitive.
  4. Click the Apply button.


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