...PCH does have a toll free number you really should ask the company!! That's my advice, call them or ask on Facebook.
But if I had to answer I'd say do NOT unsubscribe of course...I just delete my emails one by one, I don't read them unless for some reason I'd win and see it in the subject line.
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Good Luck to you, I hope you have some good luck. I have won twice from PCH facebook in the past so winners are possible! I know PCH is giving away their Super-Prize this month very soon so-- it's always fun for me because I have my entries in the sweepstakes. And like they say it is computer generated number randomly so everyone has a chance. That always keeps my spirits up, it's just a computer picking a number or entry....
Is it necessary to receive dozens from them?