My subscriber wants off the List and forwarded me an email they received.
Every email sent to your subscribers through Mail-List.com has an unsubscribe link at the bottom. (For details about the reason, please see this post about the CAN-SPAM Act.)
Most subscribers just click on that link, confirm their intent on our web page, and are then removed from your list.
Some subscribers never scroll down to the bottom of the email or just do not understand.
If your subscriber forwarded an email to you, this is an easy problem to solve. Just scroll down and click the link for them. The link contains their email address from your list.
When the web page appears, click on the Unsubscribe button. Your subscriber will then be removed from your mailing list.