What are acceptable mechanisms to handle unsubscriptions?
Ideally, the unsubscription mechanism must depend exclusively on email. Must be simple, to make it accessible to all the users without regard to their level of expertise in the use of email tools. Upon receiving an unsubscribe request, it is a good practice to confirm it, always through email. After obtaining such confirmation, the corresponding email address must be unsubscribed immediately ans sumarily. Under no circumstances deliveries to unsubscribed addresses should continue or those addresses be included in the list again, without a new subscription. Also, it is not a good practice to give those addresses to third parties for inclussion in their own lists.
