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| 0 | Message transfer in | The message transfer agent (MTA) received a message from a server, connector, or gateway. | |
| 1 | Probe transfer in | The MTA received an X.400 probe from a server, connector, or gateway. | |
| 2 | Report transfer in | A delivery receipt or non-delivery report (NDR) was received from a server, connector, or gateway. | |
| 4 | Message submission | A local e-mail client submitted a message (through the information store). | |
| 5 | Probe submission | A local e-mail client submitted an X.400 probe (usually through the information store). | |
| 6 | Probe transfer out | The MTA completed transfer of an X.400 probe to a gateway, X.400 link, or another MTA. | |
| 7 | Message transfer out | The MTA sent the message to a server, connector, or gateway. | |
| 8 | Report transfer out | The MTA sent the delivery receipt or NDR to a server, connector, or gateway. | |
| 9 | Message delivered | The message was delivered to a mailbox or public folder. | |
| 10 | Report delivered | A delivery receipt or NDR was delivered to a mailbox. | |
| 26 | Distribution list expansion | A recipient distribution list was expanded so that the message can be sent to different addresses. | |
| 28 | Message redirected | The message was sent to a mailbox other than that of the recipient. | |
| 29 | Message rerouted | The message was routed to an alternate path. | |
| 31 | Downgrading | The MTA has mapped a message, report, or probe into the 1984 X.400 protocol before transferring it to a remote 1984 MTA. | |
| 33 | Report absorption | The MTA has scheduled a report for deletion because the user did not request it. In the X.400 protocol, NDRs are always routed back to the sending MTA even if the user did not request a report. | |
| 34 | Report generation | A delivery receipt or NDR has been created. | |
| 43 | Unroutable report discarded | The MTA has discarded a report because the report cannot be routed to its destination. | |
| 50 | Gateway deleted message | The administrator deleted an X.400 message that was queued by the MTA for transfer to a gateway. No delivery report is generated. | |
| 51 | Gateway deleted probe | The administrator deleted an X.400 probe that was queued by the MTA for transfer to a gateway. No delivery report is generated. | |
| 52 | Gateway deleted report | The administrator deleted an X.400 report that was queued by the MTA for transfer to a gateway. No delivery report is generated. | |
| 1000 | Local delivery | The sender and recipient are on the same server. | |
| 1001 | Backbone transfer in | Mail was received from another Messaging Application Programming Interface (MAPI) system across a connector or gateway. | |
| 1002 | Backbone transfer out | Mail was sent to another MAPI system across a connector or gateway. | |
| 1003 | Gateway transfer out | The message was sent through a gateway. | |
| 1004 | Gateway transfer in | The message was received from a gateway. | |
| 1005 | Gateway report transfer in | A delivery receipt or NDR was received from a gateway. | |
| 1006 | Gateway report transfer out | A delivery receipt or NDR was sent through a gateway. | |
| 1007 | Gateway report generation | A gateway generated an NDR for a message. | |
| 1010 | SMTP queued outbound | | |
| 1011 | SMTP transferred outbound | Outbound mail was transferred to an Internet recipient. | |
| 1012 | SMTP received inbound | Inbound mail was received from the SMTP connector. | |
| 1013 | SMTP transferred inbound | | |
| 1014 | SMTP message rerouted | An Internet message was rerouted or forwarded to the proper location. | |
| 1015 | SMTP report transferred in | The SMTP connector received a delivery receipt or NDR. | |
| 1016 | SMTP report transferred out | A delivery receipt or NDR was sent to the SMTP connector. | |
| 1017 | SMTP report generated | A delivery receipt or NDR was created. | |
| 1018 | SMTP report absorbed | The receipt or NDR could not be delivered. | |
| 1019 | SMTP submitted message to advanced queuing | | For use by SMTP transport. |
| 1020 | SMTP outbound transfer | | For use by SMTP transport. |
| 1021 | SMTP bad mail | | For use by SMTP transport. |
| 1022 | SMTP advanced queuing failure | | For use by SMTP transport. |
| 1023 | SMTP local delivery | | For use by SMTP transport. |
| 1024 | SMTP submit message to categorizer | | For use by SMTP transport. |
| 1025 | SMTP begin submit message | | For use by SMTP transport. |
| 1026 | SMTP advanced queuing failed message | | For use by SMTP transport. |
| 1027 | SMTP submit message to store driver | The information store driver has picked up a message from the information store. | |
| 1028 | SMTP store driver local delivery | The information store driver has delivered a message to the information store for local delivery. | |
| 1029 | SMTP store driver gateway delivery | The information store driver has delivered a message to the information store for gateway delivery. | |
| 1030 | SMTP NDR all | | For use by SMTP transport. |
| 1031 | SMTP end outbound transfer | | For use by SMTP transport. |