This is very easily set, on a domain-by-domain basis, at:
The UNSUBSCRIBE link will automatically reference the newsletter name, sending domain, and the e-mail address of the user to remove.
It is not very well documented, but it works very well.
Subscribing, with a valid e-mail address, will send a confirmation message, with a link to complete the process, to the e-mail entered in the form.
Once this is completed, the user is taken to an acknowledgement form and the double-opt-in process is completed, making the list fully compliant with the CAN SPAM ACTS of the United States, Canada, EU, and Australia.
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