Our mail server rejected a few mails since early this morning which should have not been rejected. In our postfix configuration was the line reject_rbl_client dhcp.tqmcube.com, which led to the fact that a few mails were rejected with:
Client host [1.22.33.444] blocked using dhcp.tqmcube.com; Tqmcube.com is dead - all queries positive to stop people from using it - you risk loosing all mail unless you stop;
From the user’s point of view this seems pretty radical but at least they (tqmcube.com) can be sure that people will stop using their service very fast.
