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If the trigger is pulled, qmail-send wakes up and looks at queue/todo
It reads through todo/123456 and finds the sender and recipient information
It writes the sender to info/123456
It decides which recipients are local and which are remote
(There's a configuration file for this)
(If the domain is listed in control/locals or control/virtualdomains, it's a local address)
It writes local recipients to local/123456 and remote recipients to remote/123456
It destroys todo/123456
Exercise: What if qmail-send is killed partway through?
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