Question: If we add fields "Email 2" and "Email 3" from CRM how are these handled?
1) Confirm these email addresses would not be sent any email.
2) If a form completion is done with an email address that is in one of those values, will Marketo know not to create a new record?
Those fields have no special meaning in Marketo.
The only way they’ll receive mail is if you deliberately use Send Alert to send to the corresponding {{lead.token}}. Send Email only ever uses the system Email Address field.
Marketo forms will not merge on those other fields. A custom form (fully custom, i.e. not created in Form Editor and not using the Forms JS API to submit) can potentially use the Marketo REST API to merge on Email 2 or Email 3 but that requires custom development.
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