Gee, bevels in glass so it doesn't have the sharp edges. Corners on rectangles to they don't poke you when in your pocket. Total obvious garbage.
I don't know about law in any of the US, but in the UK: a private letter is considered to be "published", for libel purposes, the moment it is opened (by someone other than the party being libelled, or someone acting as their agent and with their express permission to open it)
Yes. It is roughly the same in the U.S. See HERE, in the section headed "Publication".
With the intent to cause damage. Look it up. They damaged party has to prove intent. Which is why there are almost never successful; libel or slander cases in the US.
This is not true. At least in most states, intent to harm is not required.
What IS usually required is to show that the accused knew, or reasonably should have known, that the statement was false.
That is not quite the same thing.
In addition, most corporations have as part of their employment conditions that you can't sue the company or other employees as a result of negative opinions expressed as part of "official" company communications, such as an employee review or exit interview.
Again in the U.S., that is simply not true. "Most" corporations do NOT have such a clause in their contract, and there is a very strong push to stop that practice in those states where it is still allowed. Because in some states such clauses are specifically prohibited by law, and the list of those states is growing.
The absent ones are always at fault.