<header>Delivery mode</header>
Controls when messages send to this mail server are delivered. Possible options
are :
<ul>
<li><b>Background</b><br>
Messages are delivered as soon as possible in the background.<p>
<li><b>Queue only</b><br>
Submitted messages are merely placed in the queue, and not delivered
until the queue is flushed manually.<p>
<li><b>Interactive</b><br>
Messages are delivered immediately.<p>
<li><b>Deferred</b><br>
Like <i>Queue only</i>, but no DNS or NIS lookups are done for submitted
messages.<p>
</ul>
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