On Mon, Aug 5, 2013 at 1:45 PM, Emilio J. RodrÃguez-Posada <emijrp@gmail.com
wrote:
What is the explanation for this? My spam folder is full of emails from wiki mailing lists too.
Perhaps many users don't know how to unsubscribe and mark them as spam and Google filter has learn it?
Since it includes a List-Unsubscribe header, when reporting it as spam, Google prompts the user with something along the lines of "Do you wish to unsubscribe rather than report as spam?"