I have a few different email addresses, one for work, one for home, etc., that all forward to the same POP box. I used a previous tip here to set up Mail to allow me to use my various email addresses via one "account" (since it's all the same box). I had assumed that Filemaker would pull the first email address in my preferences for the "To" field, as the tool doesn't include a way to specify that field. A dozen tests of changing various Mail preferences and poking around FileMaker, though, and it was still sending with the wrong email address.
I eventually realized that FileMaker was pulling my email address from my Address Book card -- the one that I had chosen with Card -> Make This My Card menu item. And it seemed to select the first email listing on that card, which was my personal address. Now I've created a few cards, each with a single email address, and if I need to use the script for a different purpose, I change the card using the Card -> Make This My Card menu option in Address Book before using the tool in FileMaker.

