Does Unsubscribing on Spam email work?

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by DiamondBack Truck Covers
Question by : Does Unsubscribing on Spam email work?
Meaning I get some spam email,, Like today I got one about Pennzoil oil, and down at the bottom of the page it has a option to Un subscribe to further emails. I've heard if you click on this , that it only verifies that is a active email address, and then they'll just start sending more junk email to you.
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