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Conversely, I'd assume this pattern is used rarely enough for spammers to even bother fighting it.

But I've seen service providers who insisted on creating some account with a valid email who wouldn't accept a `+` it in their forms...

My favorite was that I could sign-up with the + address but couldn't sign-in. And the support desk rejected that + address too.

The phone support person was confused about that symbol too, what an odd email.