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Re:Show HN: NBox – Sign up anywhere without giving your emai... by bdav24 on Thursday June 22, 2017 @04:46AM (#14610908)
You mean fraudsters trying to take advantage of account creation on Winterest?

For a given service we authorize only one address, but we haven't implemented a rate-limit yet.

Re:Show HN: NBox – Sign up anywhere without giving your emai... by ecesena on Friday June 23, 2017 @02:32PM (#14621509)
Yes exactly, fraudsters exploiting your service to have as many email as they need to create very many accounts on Winterest.

If you have 1 single email account per service that is fine.

I think you should call out these two aspects on your site, to show that you're increasing privacy for users, but also protecting services from being abused exploiting nbox. It should reduce the likelihood to be blacklisted.