<header>Sort mail queue by</header>

Controls the order in which the mail queue is processed. Possible options are :
<ul>
<li><b>Priority</b><br>
    Messages are processed in order of estimated resource cost.<p>
<li><b>Hostname</b><br>
    Messages are ordered by the hostname of the destination server.<p>
<li><b>Date received</b><br>
    Messages are processed in the order they were received.<p>
</ul>

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