Being on the black list just means that you can't receive e-mails from us anymore (with the exception of support e-mails). Usually, you wind up on there because you unsubscribed from our newsletters or other mails, but you can also end up on our blacklist by marking our e-mails as spam or not being able to receive e-mails (for instance, if your inbox is over capacity).
If you would like to be removed from our blacklist, all you need to do is explicitly ask us to do so (something like "Please remove my e-mail address (xxx@xxx.com) from the black list.")