There needs to be a box in the customer portal that allows them to resubscribe to receiving emails. Sometimes a customer/email receiver will opt-out, not realizing that they would be unsubscribed from everything and never to receive emails again, only to want to receive emails again. We have no way of re-subscribing someone. I get a few emails a month from people wondering why they aren't getting our emails and we have no way of fixing it.
Please put a check box in their customer portal area that allows them to re-subscribe as a general email customer.