Talking with support, they said they could not share what email validation rules they use because of their security policy. If anyone is reading this, you could easily figure out what types of emails are considered valid according to Zuora. I think most standard emails are accepted but once you get into special characters, that's where things slightly differ. All in all, your better left implementing an email validation standard that aligns with other validation rules you can find online. 9 out of 10 you'll be fine.
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