System Return and Reason Codes When Messages are Undelivered

JES XCF returns system return and reason codes if a message is undelivered. In mapping macro IXZYIXEN, SYSTEM_RETURN_CODE contains one of the decimal return codes and SYSTEM_REASON_CODE contains one of the decimal reason codes listed in Table 1.

Table 1. System Return and Reason Codes
Return Code	Reason Code	Meaning
4	4	Message was acknowledged by JES XCF because it was in a mailbox that was cleared.
4	8	System error prevented the message from being delivered.
4	16	Message was acknowledged by JES XCF because it was in a mailbox that was deleted.
4	20	Message was acknowledged by JES XCF because it could not be delivered. Either the destination member or mailbox does not exist.