Exchange 2013 Receiver frustrations

I'm having problems trying to add a receive connector for an application database - iSAMS. Basically an SMTP Relay.

It was working fine in Ex2010/Ex2013 co-existence with the  receiver on the old mail server.

I added it to the new 2013 server so that I could start decommissioning the old 2010 server and the ECP will not allow me to add it.

I choose Hub Transport and a custom rule to allow application relay.

I specify the IP address 10.3.3.23 which is an internal IP address on the 2013 mail server specifically for this relay. This used to be an IP on the old 2010 server. I then specify the 5 internal IP addresses that the email might come from on the application server.

I get the error :

The values that you specified for the Bindings and RemoteIPRanges parameters conflict with the settings on Receive connector "MAIL2013\Default Frontend MAIL2013". Receive connectors assigned to different Transport roles on a single server must listen on unique local IP address & port bindings.

When I check the settings for this FrontEnd receiver it seems to receive email from anywhere  and specifies all IP addresses that are bound to the adaptor.

The security settings are all ticked apart from Externally secured and the Permission Groups are all ticked except Partners and Exchange Users.

What I don't understand is why doesn't this Front End rule allow this email through? If its because I need to set a hub transport instead of a Front End rule then why does the FrontEnd rule stop me?

How do I overcome this issue?

Many thanks as I'm becoming increasingly frustrated.
itmtsnAsked:
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Simon Butler (Sembee)ConsultantCommented:
The frontend connector will allow email through, but only for inbound email. Therefore if your application is sending email to internal users it would be fine.
However if you need to send to external recipients, then you will need another connector.

Your mistake was choosing Hub Transport in the wizard. You need to choose Frontend Transport.
That should allow you to create the connector with the specific requirements, on the regular SMTP port.

Simon.
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