<header>Initial concurrency level for delivery to the same destination</header>
<center><tt>initial_destination_concurrency</tt></center>
<hr>
This parameter specifies the initial per-destination concurrency level for
parallel delivery to the same destination. This limit applies to delivery via
SMTP, via the local delivery agent and via the pipe mailer.
<p>
With concurrency of 1, one bad message is enough to block all mail
to a site. A concurrency of 2 seems a reasonable choice.
<hr>
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