We have Postini set up with their extended message discovery service. This requires having our exchange server set up to journal messages to their mail servers. Everything has been set up and working for months. Now, a couple of times an hour a message that we sent them is rejected as being spam. This is fine, since it usually is spam which has somehow got through the filter on it's way in, and we don't want spam in the archive anyway BUT Exchange keeps this message in queue and keeps trying to resend it:
After 24 hours, there are hundreds of messages in the queue, and Exchange is accessing the disk constantly. This is a double problem since our Exchange is in a VM, and it is causing performance issues for other VMs. If you manually clear down the queue it's fine again, until the queue refills.
How can I get Exchange to bin the messages it cannot send to Postini?