P -- Precedence Definitions

Values for the Precedence: field may be defined using the P control line. The syntax of this field is:

When the name is found in a Precedence: field, the message class is set to num. Higher numbers mean higher precedence. Numbers less than zero have the special property that if an error occurs during processing the body of the message will not be returned; this is expected to be used for bulk mail such as through mailing lists. The default precedence is zero. For example, our list of precedences is:
People writing mailing list exploders are encouraged to use Precedence: list. Older versions of sendmail (which discarded all error returns for negative precedences) didn't recognize this name, giving it a default precedence of zero. This allows list maintainers to see error returns on both old and new versions of sendmail.

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Last modified: Friday April 02, 1999.