Letters to the Editor
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Really; the writing is on the wall
Frankly, I would consider what kind of career I could achieve working for a child or a company that condones someone at the manager level behaving like a child. But obviously I passionately hate those emails and have no professional respect for those who waste everyone else's time sending them.
A option I would seriously consider is to set up an email rule that sends email from the manager with certain conditions (say with "FW: FW: *" in the subject) to the trash. When you're grilled for missing an email from that manager explain you have set up a rule because you have no interest, or time to waste, on ridiculous chain mail.

