Problem creating SMTP Server Publishing Rule

In trying to follow documentation to create an SMTP server publishing
rule to create an SMTP filter and relay as listed here: 

http://isaserver.org/tutorials/messagescreeneronfirewallpart2.html

 

I get an error stating:

ISA server cannot save the new object

There is already a rule that defines a mapping for the external port and
IP address specified. 

 

I configure this rule with the following settings: 

IP Address of internal interface of the ISA server.

IP on external interface of ISA server that handles mail. 

 

Apply rule to SMTP server

Apply rule to Any request 

 

I notice that there is already a Mail wizard rule in place, but it lists
the IP of the internal mail server and not the internal interface of the
ISA server. 

I've followed the steps as outlined in part 1 of this article so what
could I be missing here? 

Any feedbacks appreciated

 

Thanks 

 

 

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