I have a custom module for basic project handling, which uses a "vendor" lookup.

As usual this gives me a related list for "vendor" in the custom module. 

I wish to create a blue print for the custom module that sends an email to the contact email address of the linked "vendor".

This doesn't appear to be an option in the email alert section of the "after" tab of the transition.

Is this possible please? Or any alternative ideas?

Simon