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Glenn Nyhan 54Glenn Nyhan 54 

Alternating Email Field Selection to Send Email

I just got asked to do something unusual. We are using Fonteva as our event reg platform. There is an underlying issue with the software they are working on. But till then we are faced with this problem. Sometimes their native email field populates and a registration confirmation is sent, and sometimes it isn't for the contact. I have been asked to add the Contact email field (from the Contact object) to the Attendee object, which I've done. What I want to do is this. If the native Fonteva email field is blank then use the Contact email field and send the email. Is there a way to do this, say with Process Builder, Workflow, Flow Script or a formula?