I don't bother with "unsubscribe" either. I think they just sell those lists to other spammers too. Google catches just about all of the junk and sends it to the spam folder, so it's never in my inbox anyway, and I can delete the whole spam folder at once with just one click without even having to read the junk. I just scan thru the subjects to make sure no legit mail got sent there by mistake before I do.
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