Fix MailboxMessageService thread leak/explosion #6549
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Each time when MailboxMessageService.onAdded(...) got called with multiple mailbox entries a new thread got created. That thread was never shutdown. This change explicitly creates a new Thread and sets its result with a SettableFuture. After its computation the thread terminates.
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Each time when MailboxMessageService.onAdded(...) got called with multiple mailbox entries a new thread got created. That thread was never shutdown. This change explicitly creates a new Thread and sets its result with a SettableFuture. After its computation the thread terminates.