Sam Jones:
> That looks like a good starting point, Thank you for the pointers
> Robert, really appreciated.

You need to keep the following in mind, if you ever decide to use
a per-destination recipient of 1.

        Wietse

default_destination_rate_delay (default: 0s)
       The default amount of delay that is inserted between individual  deliv-
       eries  to  the  same destination; the resulting behavior depends on the
       value of the corresponding per-destination recipient limit.

       o      With a corresponding per-destination recipient limit  >  1,  the
              rate  delay  specifies  the  time between deliveries to the same
              domain.  Different domains are delivered in parallel, subject to
              the process limits specified in master.cf.

       o      With a corresponding per-destination recipient limit equal to 1,
              the rate delay specifies the time between deliveries to the same
              recipient.  Different recipients are delivered in parallel, sub-
              ject to the process limits specified in master.cf.

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