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Nice, with pushdata, do you check if someone uses the same GMail account using GMail's "plus" and "dots" [0] features? (E.g. given bob@gmail.com, then bob+anything@gmail.com, b.ob@gmail.com, bo.b@gmail.com, b.o.b@gmail.com etc are all valid and points to the same address.)

0. https://gmail.googleblog.com/2008/03/2-hidden-ways-to-get-mo...

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Nope, there is no restriction for plus addresses. I validate email addresses and specifically allow + and . in the part before the @ sign. myemail+1@mydomain.com and myemail+2@mydomain.com will be considered two different users.

Have to add also that the "plus feature" isn't a Gmail-specific invention but a standardized way of referring to the same mailbox using different addresses. But some email providers don't support this feature, and many input validators out on the Internet don't either.

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