Can you give a little more information about why you think this is the thing to set, and what exactly you mean by the "manually flush mail queue" issue?
What I'm seeing is that both incoming and outgoing mail build up in the queue. On the order of 100s of messages. Every once in a while, if left on its own, the queue will empty. Typically this happens roughly every 30 minutes, but it's variable; and this is despite the fact that it's supposed to happen every 1 minute. There is nothing in the logs (even with debug logging enabled for incoming and outgoing mail) to indicate that anything is going wrong.
However, if I flush the mail queue with the button on the web page from the admin console, it works, and fairly rapidly. In seconds, well under a minute.
So I wrote a horribly hacky script to automate pushing the button once a minute. Now I never have anything in the queue that's more than a minute old. But I'd like a less hacky solution.
Does this mirror the kind of behavior that you're seeing? Do you have any evidence that the problem is a lack of threads in the quartz scheduler? I haven't been able to find any useful debugging information in the logs about any scheduling problems.
My theory is that the perhaps the scheduler is overloaded, and then this happens, it just silently drops items from the queue. And that the only reason it works every once in a while is just luck, and not some inherent behavior related to how much time has passed or how many messages have built up.
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