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