We’ve prevented customers from entering the same email in the From and To fields but if someone has two accounts there’s really no way to prevent that. What you can do, however, is either not incentivize email shares or make the coupons less valuable (e.g. 5% off for a tweet but only 1% off for an email).

The real value is in the one to many sharing like Facebook, Twitter, and other social services provide.

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