Configuring Exchange 2007/2010 to use a Smarthost
Routing all mails to a smarthost :
A Send Connector must already have been created and configured correctly on the Hub Transport server.
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Open Exchange Management Console.
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Click on the '+' next to Organization Configuration.
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Select Hub Transport and select the 'Send Connectors' tab.
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Right-click on the existing Send Connector, select 'Properties' and go to the Network tab.
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Select "Route mail through the following smart hosts:" and click 'Add'.
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Enter mxsrv1.spamgateway.comodo.com (you need to use port 587).
If you have more then one Smarthost, repeat the previous two steps.
The changes to the Send Connector will take effect immediately without you having to reboot the server or restart any services.
In order to change the port to 587 you will have to issue the following command in the Exchange Powershell Console:
Set-SendConnector -identity "NAME OF CONNECTOR" -Port:587
Restart the transport service.
Routing all mails to a smarthost with Username Authentication:
A Send Connector must already have been created and configured correctly on the Hub Transport server.
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Open Exchange Management Console.
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Click on the + next to Organization Configuration.
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Select Hub Transport and select the 'Send Connectors' tab.
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Right-click on the existing Send Connector, select 'Properties' and go to the 'Network' tab.
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Select "Route mail through the following smart hosts:" and click 'Add'.
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Enter mxsrv1.spamgateway.comodo.com, mxsrv2.spamgateway.comodo.com in the FQDN section.
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Click 'Change' under the smart-host authentication.
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Select 'Basic Authentication' and tick the TLS box.
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Add your newly created username and password.
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Click 'OK '.
The changes to the Send Connector will take effect immediately without you having to reboot the server or restart any services.
In order to change the port to 587 you will have to issue the following command in the Exchange Powershell Console:
Set-SendConnector -identity "NAME OF CONNECTOR" -Port:587
Restart the transport service.

