[Mailman-Users] simple option to unsubscribe from list via email or single click

Hi,

I am looking for the simplest method of users unsubscribing from my Mailman list, either by replying to the list with 'unsubscribe' in the subject or the body, or a one click link in the footer that opens an email that can be sent to unsubscribe or which redirects a user to a webpage confirming they have unsubscribed.

Would someone be able to help me set this up?

Thanks,

Nick