Blogs

As of noon on March 25 (EST) ORDB, a blacklist that has not been in use for some time, began returning false positives. They did this as a way to forces users that continue to query their spam filters to stop. The overall effect is that all mail will be blocked on servers that are configured to use the ORDB service.
All that being said if you start to notice any major issues with some items not getting through you might want to have the end users check their spam filter configurations.