It at least declares your intent for the message, which one presumably holds the copyright upon (although technically the company might own the copyright, I'm a

It at least declares your intent for the message, which one presumably holds the copyright upon (although technically the company might own the copyright, I'm assuming that as the primary agent of the company in regard to that work, the author has some leeway). Unauthorized distribution of the mails would usually be a copyright violation, and excuses to the contrary can be negated by including a huge chunk of text that says "this must be private, seriously". So yes, I see how it can help kind of but not really. It doesn't really change anything, just makes a case tighter should you need to make one, lest the defendant imply he had your authorization to distribute the mails. IANAL.