Security News > 2018 > April > Obscure E-Mail Vulnerability

This vulnerability is a result of an interaction between two different ways of handling e-mail addresses. Gmail ignores dots in addresses, so [email protected] is the same as [email protected] is the same as [email protected]. (Note: I do not own any of those email addresses -- if they're even valid.) Netflix doesn't ignore dots, so those are all unique e-mail addresses and...

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https://www.schneier.com/blog/archives/2018/04/obscure_e-mail_.html