Yes, both incoming and outgoing spools have "Timeout frozen after:" set to 1h.
If a message is frozen, I have mailcleaner blow it away in 1 hour. If a message is not frozen, it should retry for 24 hours before getting returned to sender.
Question 1) What is the difference between "frozen" and a message sitting there waiting for retries which is NOT in "frozen" status?
Question 2) With frozen timeouts at 1h for both queues, and the exim retry intervals set to a max of 24h as shown in my first post, can you think of a reason mail will sit in the outbound spool forever, until I manually remove them?