"This is because these unsubscribe links usually take you to a web page via a URL embedded in the unsubscribe text that identifies your email address, either in plain text or via an alphanumeric code. The moment this unique URL loads, the spammer at the other end knows that you were the one to click it; they now know that the email address they blasted does, in fact, have a real person at the other end."
"If the email is from a spammer, there is a high chance that they will not-and never intended to-delete your email address from their database. In this case, clicking on that unsubscribe link reveals to the spammer that the email address they've sent the message to is being read by a human. This confirmation usually only makes your email address a target for even more spam emails. This is the best-case scenario."
Unsolicited unsubscribe links frequently embed unique URLs or alphanumeric codes that reveal the recipient's email address when loaded. That confirmation tells senders that the address is active and read by a human, which often increases the volume of future spam. Some malicious messages mimic legitimate organizations and use unsubscribe links to direct recipients to sites that request credentials or personal data. With few exceptions, avoid clicking unsubscribe links in emails from unknown senders. Safer actions include marking messages as spam, blocking the sender, using provider-managed unsubscribe tools for known senders, and using disposable or alias addresses for sign-ups.
Read at Fast Company
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