Thanks in advance. The scenario is: When a new email is created containing an address pre-populated in the "To" field then clicking a custom form button, copy that email into the custom form's "To" field and close the original new email. (essentially replacing the original regular email with the form pre-populated with the original "To" address).
The Custom form is working fine but I'm confused on how to talk to or pull the data from that first email to the form when the form opens.