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Email address is the primary key within Marketo.
No deduplication is needed via forms.
There are other processes, such as manual lead creation, uploads/imports, and syncs from other systems that contain multiple records that can cause duplicates.
I re-read the question and the key phrase is ' fills out the form', so yes there will only be one record.
Duplicates come about through:
- Manual input
- Merge from SalesForce
- Merge from MS Dynamics!
Only one record.No duplicate email address.