Did it ever happen that you wanted to unsubscribe from a newsletter and you could not? Or that it was very tedious and you gave up in the middle of the process?
If that happened to you and you do not want your users to get fastidious in the same way with your system, I'll tell you what are the common mistakes when unsubscribing from a newsletter so you can take them into account when trying this functionality.
I filmed this video in Esquel, a wonderful place in the province of Chubut in Argentina.