Disclaimer: I am in the U.S. and my comment below will reflect this.
Because of the Berne Convention, your comments apply in many places.
Wouldn't an individual's email be covered by copyright?
Yes, since it appears that the processed-pork product is attached to in-bound mail. The sender may or may not have agreed to such behaviour. This is rather reminicent of M$'s "smart links".
It would be different if the spam where attached to out-bound mail, as the sender can be forced to agree to having their email modified as a condition of having an email address.
Would a small copyright notice at the bottom open up spammers to litigation without further legislation?
Not necessary, since applies at the moment of creation.
I am BOFH. Resistance is futile. Your network will be assimilated.
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