System flow action sysActionChangeDataValue updateLeadEmailStatus
System flow action sysActionChangeDataValue resetLeadEmailStatus
'updateLeadEmailStatus' refers to durable unsubscribe updating existing records. So when a record's unsubscribe value get's manually changed, the other duplicate record(s) that has the same email address will get updated by the durable unsubscribe and 'updateLeadEmailStatus' will be logged for the updated leads.
Whereas, 'resetLeadEmailStatus' refers to durable unsubscribe updating a new record, when its existing duplicate record(s) that has the same email address have 'unsubscribed=true'. So when a new record is created and the other duplicate records have 'unsubscribed=true', the new record will be updated by durable unsubscribe and 'resetLeadEmailStatus' will be logged for the new record.
The 'resetLeadEmailStatus' can also occur as follows: