5 = Delivery to this address failed permanently. The error message
should be placed in the fourth field so that a bounce message may
be generated.
-
+
+
+ INSTRUCTION: envelope_from
+ SYNTAX: envelope_from|blurdybloop@example.com
+ DESCRIPTION:
+ Sets a value to be used as the envelope sender during the 'MAIL FROM:'
+ phase of the SMTP transaction. If an envelope sender is not supplied,
+ one is extracted from the message body.