A message can contain multiple means to unsubscribe: an email address, for example, and a web page.
If you do not find unsubscription instructions in a message from a mailing list, you can examine the full message source for lines starting with "List-Unsubscribe" and take appropriate action. More commonly, email services such as Windows Live Hotmail and Gmail will offer an Unsubscribe button that takes the specified action automatically.
- List-Unsubscribe:<mailto:email@example.com?subject=Unsubscribe>: Send a message with "Unsubscribe" in the Subject: line to "firstname.lastname@example.org".
- List-Unsubscribe:<http://list.example.com/unusbscribe.php?email=me%40example.com>: Open the address "http://list.example.com/unusbscribe.php?email=me%40example.com" in a browser.