Some NDA's require that you must state your intent for each communication that should be covered by the NDA.
I can believe that such NDAs may exist, but I'm pretty sure I didn't sign one as a condition of subscribing to nanog. In reality, boilerplate confidentiality notices merely document the fact that a mail system is in the grip of the clueless and/or confused. R's, John
As much as everyone would like to believe these are wothless, they are not. Applying them globally to your email protects your legal rights.
I would be most interested in any case or statute law supporting this utterly implausible assertion. I'm aware that there is a rule among attorneys that they're not allowed to use material faxed from one to another by mistake, but since this isn't fax and we're not lawyers, it doesn't apply.