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I'm actually going to use a smtp-email-validation from google which I'm still not sure if that is enough

How about if I asked "What are the last three characters of your email account before the @ symbol" ?

I think that a "hacker" could try and attempt random possibilities eg, a,ab,abc,abcd, and...

This is not a programming question.

Rather, security.

When I take in the user's information, email, username, account, I also take in their IP address and current time which outputs a 10...