After you install MailMarshal and run the Configuration Wizard, you may need to change the email routing on other computers so the MailMarshal Server becomes the gateway for incoming and outgoing email. For more information, see “Understanding Installation Scenarios”. These routing changes can require you to adjust one or more of the following items:
If you install the MailMarshal Server on a server with a different name or IP address from your prior email server, change the MX records that control email delivery from the Internet.
Internal email server settings
Configure all other internal email servers within your organization to forward outgoing email to a MailMarshal Server for delivery. In some cases, you may also want to route email between local domains through MailMarshal.
Port settings
In some cases, MailMarshal is configured as a single server on the same physical server as other email software. In this case, change the settings of the other email software to allow MailMarshal to receive SMTP connections from the Internet on port 25. Configure alternate ports so that MailMarshal and the other software can exchange email.
Firewall or relay server settings
If MailMarshal receives incoming email from a firewall that employs address translation, change the translated address for incoming email to the address of the MailMarshal Server. If the firewall or another server acts as an email relay, change the address to which it forwards inbound email to the address of the MailMarshal server.