In each letter I put the tag [UNSUBSCRIBE_URL]. When you click on this hyperlink the subscriber gets to the page where he is invited to confirm the rejection of the mailing. That is, to unsubscribe, the subscriber needs to do 1 click on the hyperlink in the email tagged as [UNSUBSCRIBE_URL], and then go on to make this link more 1-click to confirm your cancellation. That is, it turns out 2 clicks. Can I do to unsubscribe from the mailing list for 1-click?