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Many sign up forms disallow the use of '+' in email addresses, either to prevent this, or more likely because the programmer wasn't aware it was a valid character for an email address in the first place.

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If you're not going to verify that the email address they're giving you is real, why restrict them to your idea of what goes in an address? I often fill in my email address as fake@fake.fake . It's pretty easy to see that that's invalid -- to the best of my knowledge, there is no .fake TLD, and there certainly wasn't when I started doing it. But, I've never seen a form reject it.

You validate email addresses by sending confirmation emails. What's the thinking behind pretending you're doing it in the form?

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