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Comment by DHowett | Hacker News Reader

a@[IPv6:2001::1] is, unfortunately for your validation regex, a valid e-mail address.

[EDIT: I see that you consider TLD-free e-mail addresses undeliverable; still!]

  .+@.+

FTW?

That's what we do. Everything else is just lying to yourself and hoping for the best..

Or, more simply, `.@.`.

Enjoy getting a billion e-mails per second written to root@localhost

As if. There would be a single confirmation email sent which would not be clicked.