When I was practicing, every email I sent included a phrase that indicated that the contents may be confidential and protected by a claim for solicitor-client privilege.
That clause was there in order to:
1) help support a claim of solicitor-client privilege, even if the information went to the wrong person by mistake; and
2) help support a demand to a third party to keep information confidential.
The clause is there so that if the confidentiality of the email is unclear, it will be presumed to be confidential - it leaves it up to the recipient to enquire about sharing.
If you have that at the end of your email, it is sloppy to send out something that is intended to be public without saying so.
And as to Kodak sending something to you that is not intended to be shared with the public, I would expect that they would treat the email as private, unless you invited them to share it.