KB - Using ORF with non-Exchange SMTP servers

Using ORF with non-Exchange SMTP servers

Article was last updated on May 8, 2013. View products that this article applies to.

As ORF integrates closely with Exchange / Microsoft® IIS SMTP Service and relies heavily on them to filter emails. Other, non-Exchange email servers with their own SMTP engine (like MailEnable, Xmail) are not supported directly.

ORF can be used in such setups with a perimeter IIS SMTP server only, which receives all emails first, then relays filtered emails to the non-Exchange server running at the back-end.

Setup instructions:

  1. Install the IIS SMTP Service, either to the local server or to a separate, perimeter server. On Windows 2008, this can be achieved by clicking Start > Administrative Tools > Server Manager > Roles > Add Roles > Web Server (IIS). Make sure to include the IIS Management Console and IIS 6 Management Console features. To Enable the SMTP Server, start the Server Manager, select Features and Enable SMTP Server.
  2. Make sure all incoming emails are first received by IIS SMTP on port 25. (IIS 6.0 Manager: SMTP Virtual Server properties / General tab / Advanced button)
  3. Change the listening port of your non-Exchange email server to something else, e.g., 2525 (consult the documentation of the non-Exchange server for instructions).
  4. Set the outgoing port of the IIS SMTP Server to the same port where your non-Exchange server listens (IIS 6.0 Manager: SMTP Virtual Server properties / Delivery tab / Outbound connections / TCP port, 2525).
  5. Add your non-Exchange server as smart hosts (IIS 6.0 Manager: SMTP Virtual Server properties / Delivery tab / Advanced / Smart host). The smart host IP should be set to if the IIS SMTP Server and the non-Exchange server reside on the same computer. Make sure the Attempt direct delivery before sending to smart host option is disabled.
  6. Add your domains as "remote domains" with the same smart host settings: expand the SMTP Virtual Server node, right-click Domains, and select New Domain which will launch a wizard. Select Remote and Next. Enter the name of the domain.

After verifying that all incoming emails are relayed correctly, you can start the ORF installation process which will recognize the IIS SMTP installation.

Applies To

The article above is not specific to any ORF versions.

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