10 on page 1148) is negative, the message
is classified as nonurgent. When it is greater than zero, the message is classified as urgent.
Otherwise, it is normal.
As of V8.7, a Priority: header is also available (see ?§25.12.29 on page 1161) to directly
specify the message priority and thereby bypass the need to set the value using the
Precedence: header.
Priority: urgent
Priority: normal
Priority: non-urgent
There is currently no way to specify a Priority: header??™s value from the sendmail
command line.
Beginning withV8.10, in addition to an interval specification, you can use the literal term
now to force an immediate bounce. This term is best used from the command line in
conjunction withan appropriate queue specifier (see ?§11.8.2.3 on page 431 and ?§11.8.2.5
on page 432). For example:
% /usr/sbin/sendmail -qGbadqueue -OTimeout.queuereturn=now
Here, the messages in the queue group badqueue will all be bounced.
Beginning withV8.13, a new priority keyword, dsn, has been added to the previous three
(urgent, normal, and non-urgent). If the precedence of a message is normal (zero), and if the
message is a return DSN message, the timeout defined by this new keyword is used. One
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24.9 Alphabetized Options | 1107
handy use for this new keyword is to return DSN messages sooner than normal mail.
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