Are Email disclaimers binding?

I have been seeing these more and more recently. The question is, are they binding? This is an example taken from a recent Netgear email.

[i]This e-mail, including attachments, may include confidential and/or proprietary information, and may be used only by the person or entity to which it is addressed. If the reader of this e-mail is not the intended recipient or his or her authorized agent, the reader is hereby notified that any dissemination, distribution or copying of this e-mail is prohibited. If you have received this e-mail in error, please notify the sender by
replying to this message and delete this e-mail immediately[/i]