The following is a list of codes that are sometimes associated with an
Exchange Server non-delivery report (NDR). The codes are broken down into
two categories: Reason Codes, and Diagnostic Codes, which are sometimes
associated with NDR from the message transfer agent (MTA).
Reason Codes on Non-Delivery Notifications
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0 | transfer-failure |
1 | unable-to-transfer |
2 | conversion-not-performed |
3 | physical-rendition-not-performed |
4 | physical-delivery-not-performed |
5 | restricted-delivery |
6 | directory-operation-unsuccessful |
Diagnostic Codes on Non-Delivery Notifications from MTA
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0 | unrecognized-OR-name |
1 | ambiguous-OR-name |
2 | MTS-congestion |
3 | loop-detected |
4 | recipient-unavailable |
5 | maximum-time-expired |
6 | encoded-information-types-unsupported |
7 | content-too-long |
8 | conversion-impractical |
9 | implicit-conversion-prohibited |
10 | implicit-conversion-not-subscribed |
11 | invalid-arguments |
12 | content-syntax-error |
13 | size-constraint-violation |
14 | protocol-violation |
15 | content-type-not-supported |
16 | too-many-recipients |
17 | no-bilateral-agreement |
18 | unsupported-critical-function |
19 | conversion-with-loss-prohibited |
20 | line-too-long |
21 | page-split |
22 | pictorial-symbol-loss |
23 | punctuation-symbol-loss |
24 | alphabetic-character-loss |
25 | multiple-information-loss |
26 | recipient-reassignment-prohibited |
27 | redirection-loop-detected |
28 | DL-expansion-prohibited |
29 | no-DL-submit-permission |
30 | DL-expansion-failure |
31 | physical-rendition-attributes-not-supported |
32 | undeliverable-mail-physical-delivery-address-incorrect |
33 | undeliverable-mail-phys-deliv-office-incorrect/invalid |
34 | undeliverable-mail-physical-delivery-address-incomplet |
35 | undeliverable-mail-recipient-unknown |
36 | undeliverable-mail-recipient-deceased |
37 | undeliverable-mail-organization-expired |
38 | undeliverable-mail-recipient-refused-to-accept |
39 | undeliverable-mail-recipient-did-not-claim |
40 | undeliverable-mail-recipient-changed-addr-permanently |
41 | undeliverable-mail-recipient-changed-addr-temporarily |
42 | undeliverable-mail-recipient-changed-temporary-address |
43 | undeliverable-mail-new-address-unknown |
44 | undeliverable-mail-recipient-did-not-want-forwarding |
45 | undeliverable-mail-originator-prohibited-forwarding |
46 | secure-messaging-error |
47 | unable-to-downgrade |
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253 | No Report required |
254 | Per-recip failure |
255 | Omit any diagnostic code |