A Special Case: From:<>
Among the rules in a typical canonify rule set 3 are those that
handle empty addresses. These represent the special
case of an empty or nonexistent address. Empty
addresses should be turned into the address of the
pseudouser that bounces mail,
MAILER-DAEMON:
R $@ $@ < @ > empty becomes special
Here, an empty address is rewritten to be a lone
@ surrounded by
angle braces. Other rule sets later turn this
special token into $n (which contains MAILER-DAEMON as its
value).
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