This must be a problem for every store that has a welcome discount for 1st time customers. Some will come back time after time with new email addresses. It would be a shame if we would have to add and extra app for a function to work properly. “Limit to one use per customer” could have some check boxes that allows to narrow it down. 
1 time per address, 1 time per email. Could you please talk with the developers again?
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