What is a good method to recover from a backup of a courier-mta server or migrating?
The fact that the inodes wouldn't match the filenames in most cases. What are people doing?
It's rather unlikely that restoring yesterday's mail queue is such a hot idea. Therefore, the most likely scenario is that you're recovering an entire machine. In which case rm -rf msgs/* msgq/* will do the trick.
As far as migrating goes, make sure the new server allows relaying from the old server's IP address, then put the new server in old server's esmtproutes, and flush the queue a couple of times, until everything is transferred to the new server.
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