Precedence:
Set ordering in queue sendmail
The Precedence:
header, when the QueueSortOrder option (QueueSortOrder on page 1073) is
appropriately set, is used internally by
sendmail to order the
processing of messages in its queue. A full
description of the possible field values for this
header is given in The P Configuration Command on page
1149. The effect of those values on ordering the
queue is described in How the Queue Is Processed on page
426.
The Precedence:
header should never be declared as an H line in the
configuration file. However, P precedence lines
should be declared in that file.
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