[exim] Delaying first delivery from queue

Hello,

I am looking for a way to delay the _first_ delivery of queued messages.
Exim has a complex configuration meachanism to specify how long to delay
_retries_, but this seems to only apply once a message has had a
(temporarily) failed delivery. I have never used that part of Exim
before so it is possible I overlook a way to make it do what I want.

For example, say I run an exim daemon with -q30, and the runs fall on 20
and 50 minutes after each hour. At 13:45 a message is received which
goes on the queue (submitted with -bdq, queue_only applied, etc.). I
would like the queue run at 13:50 to ignore this message, and the one at
14:20 to pick it up and attempt to deliver it.

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