Andrew:
I did consider that option and even thought it was the solution for a few moments. The Ship To list would then represent external trade firms that provide services to the customer (the Adagio user is an intermediary arranging services for the customers).

But maintenance of the Ship To list becomes difficult because, while the user only has a dozen clients in this situation, the list of external trades is about 200. That's a fair amount of updating as trades are added or changed.

But what convinced me was a discussion with the manager of that division. They have been using QB and he said "in QB, we just print the Work Order to Outlook and then select the email address from there, plus type the covering message - one click". He wasn't happy with the number of steps that I demonstrated in the Adagio model. In the end, since he is compromising on other things, I am happy to find a solution that gives him exactly what he wants in this issue.