internal API handles it.
D Destination Contains name of the system this message should
be sent to, for mail routing (private mail only).
-E Extended ID A persistent alphanumeric Message ID used for
+E Exclusive ID A persistent alphanumeric Message ID used for
network replication. When a message arrives that
- contains an Extended ID, any existing messages which
- contain the same Extended ID and are *older* than this
+ contains an Exclusive ID, any existing messages which
+ contain the same Exclusive ID and are *older* than this
message should be deleted. If there exist any messages
- with the same Extended ID that are *newer*, then this
+ with the same Exclusive ID that are *newer*, then this
message should be dropped.
F rFc822 address For Internet mail, this is the delivery address of the
message author.