Either the website admin (me) or the hosting provider (URLJet for us) has to request a rerate on the blacklisting. We are on a shared server, so all sites on that server use the same e-mail IP address as the sender, so it's possible one of the other sites triggered it.
Both myself and URLJet have requested a rerate, so hopefully it gets removed and stays that way.
Both myself and URLJet have requested a rerate, so hopefully it gets removed and stays that way.