Overview

• Cybercriminals embed tracking codes in email unsubscribe buttons to detect clicks and confirm active accounts for resale.
• DNSFilter analysis shows roughly one in 644 unsubscribe links can redirect users to potentially malicious websites.
• Once verified, these “live” email addresses fetch premium prices on underground forums.
• Security advisors recommend using list-unsubscribe headers in Gmail, Outlook and other services to opt out safely.
• Users are also advised to mark unknown senders as spam, update email apps and antivirus software, and employ privacy tools such as Apple’s Hide My Email.