How do I assign a user to a user field using an email? I have a creator form that I'm creating from a CRM deluge script and tying to the Deals module via a related list. I need the Deal Owner to be the owner of the Creator record to view the record in the related list. I thought I could assign the record owner using the deal owner's email, but I couldn't get that to work. I also couldn't find any integration tasks or APIs that would solve this issue.