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

[Nick Putman]

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