| http://www.w3.org/ns/prov#value | - While 95% of all commercial e-mails from reputable bulk emailers with an unsubscribe feature indeed work in this manner,[3] unscrupulous senders and spammers can also include a link that purports to unsubscribe a recipient; clicking the link or button confirms to the originator that the e-mail address used was a valid one, opening the door for further unsolicited e-mail.[4]
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