If you have been getting a lot of spam and are continually unsubscribing from them to no avail then don't! because these are lists that are run by spammers to harvest email and verify active accounts this article sheds more light on this.
Harish Srinivas
“Autodidact with an insatiable thirst for learning something new everyday. Wearer of many hats. DevOp Engineer/Release Engineer, Security Engineer, Linux fanatic, Amateur photographer, Maker & Novice App developer.”
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