Another idea for a new feature would be to let MaxBulkMailer check a certain email address for unsubscribe messages. So it would be possible for recipients of mailinglists to unsubscribe via "to unsubscribe reply to this message and set the subject to UNSUBSCRIBE".
MaxBulkMailer checks the account these messages are sent to and deactivates the addresses in the mailing list that have sent the unsubscribe-messages.
looking forward for the new release