Re: Plus sign in email addresses is often fun
No. Just no.
You should never, ever attempt to "validate" an email address.
Ok, it's worthing checking that it's got at least one "@" followed by at least one printable character, but beyond that?
Not worth the cycles.
Just send an email to it - after all, you don't actually care whether it's RFC compliant, you care whether there's a mailbox at the end of it.