[Exim] [Wishlist] Have exim log the time on queue

Hi,

I would like to have an option to allow exim to log the time a message
has spent on the local queue in the delivery log entry. That way, it
would be very easy to deliver statistics of "average time on queue"
for each message.

Logging the time difference between reception and delivery of a
message would be fine.

Greetings
Marc

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