Web Page Subscribers - Can't figure out how to change this

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A customer received a Web Page Subscriber email when she signed up that says she can have 10% off her next order.

The thing is I don't know how this email got there and I don't know how to change it. I don't offer 10% off. I have mail chimp and I can't find anything that is ongoing there and I can't find anything on my admin pages. I've not see anybody else get this email. I don't have any email campaigns going on except abandonded cart.