Although you can define any string you choose, only five have any universal meaning.
Those five usually appear in sendmail.cf files like this:
Pspecial-delivery=100
Pfirst-class=0
Plist=-30
Pjunk=-60
Pbulk=-200
You can, of course, define your own precedence strings for internal mail, but they
will be ignored (evaluate to 0) by all outside sendmail programs.
The classes junk and bulk are also recognized by many other programs. Newer versions
of the vacation(1) program, for example, silently skip replying to messages that
have a Precedence: header line of junk or bulk.
This is the Title of the Book, eMatter Edition
Copyright ?© 2007 O??™Reilly & Associates, Inc. All rights reserved.
1150 | Chapter 25: The H (Headers) Configuration Command
As a general rule, special-delivery is rarely used. Most mail has a class of firstclass.
Mailing lists should always have a class of list or bulk.
Because your local sendmail.cf file is where values are given to these class names, you
are free to modify those values locally. The values affect only the delivery at your site.
Old versions of sendmail didn??™t return errors on messages witha negative precedence.
V8 sendmail does but omits the message body.
25.11 Pitfalls
??? Not all MTAs are as RFC2822-compliant as sendmail. Occasionally, headers
appear that were legal under the long-time defunct RFC733.
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