Isn't that quote of yours confidential?
Not in my view. This information is given out to anyone who requests it, without signing of a non-disclosure agreement.
In most countries the recipient of mail can make the message public if he decides so. Usually considerations regarding privacy must be made however (you can't reveal
legally confidential material, such as medical records). A company writing "confidential" on some document doesn't make it legally confidential, especially if you're willing to mail it out to anyone and everyone.
It all changes if you're employee of the said company and/or have signed NDA with them. Your contract and/or the NDA typically stipulate some rather serious reprimands in case of an offense. Often such breach results in termination of employment / agreement.