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Many companies track more than one email adress of their customers, typically a work email and a personal email. The contact table has fields for three email addresses. When someone submits and email address as part of an event registration form submission, it should be possible to check that email against all three email adresses in the contact table. Today you can capture an email, but only check against the corresponding email 1, 2 or 3 field in the contact table. If you use the primary email field in the form, it may very well be that the entered email from the form is in email2 on the contact. The result of this is that you end up with a duplicate contact that needs to be merged. This creates a lot of wasted time to clean up.

STATUS DETAILS
Needs Votes
Ideas Administrator

Have you explored our enahnced matching rule builder? Matching rule here can do email1 in form = email1 on contact record or email2 in form = email2 on contact record.

But that means you need both email address fields in the form. You can add email2 as a hidden field to the form and auto-populate it with a script.