If the unique key, or Individual ID, is placed in a custom field or for example an identifier, usually the deduplication logic is carried over to the field concerned, but in practice it means that:
- the creation of duplicates on the email is possible at the database level (if several identical emails having a unique key are inserted in database)
- Duplicated emails can naturally appear in the filters
- The deduplication is carried out on the targeted emails in the context of an email campaign
- Deduplication is done on the targeted numbers (cellphone field) as part of an SMS campaign