I bought a Galaxy S6 edge + did a hard boot on it and it now wants the previous owners email

No, you will need to get the log-in info from the previous owner, log in, add your account and remove theirs.
 
Ah, so you haven't rooted it? Good! Just add your account and remove theirs and keep a note of your password safe. I would also recommend setting up a Samsung account.
 

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