2005

10

17 Delivery Status Notification (Failure)
18 failure notice
19 Mail delivery failed: returning message to sender
20 Mail System Error - Returned Mail
21 Returned mail: see transcript for details
22 Returned mail: User unknown
23 Undeliverable Mail
24 Undeliverable message
25 Undelivered Mail Returned to Sender
26 メッセージを配信できません