Resolution emails

Resolution emails

Hello,
 
When a request or incident is resolved, can you have it set to automatically email an external email address e.g. a vendor?
 
Reason being, a vendor would like to be notified everytime a certain type of software request is resolved.
 
I've looked under Business Rules, and in the Resolution Tempates - but the only way I can see how to achive this is to manually populate the Email ID: field in the case before it's resolved .. which is not ideal, and can easily be missed.
 
Is there another obvious and automatic way to achieve this?
 
Thank you
Nicola

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