| Platform SDK: MAPI |
The PR_TRANSPORT_KEY property contains a value used by the MAPI spooler to track the progress of an outbound message through the outgoing transport providers.
| Header file: | MAPITAGS.H |
| Identifier: | 0x0E16 |
| Property type: | PT_LONG |
| Property tag: | 0x0E160003 |
Do not use this property. It is reserved for use by MAPI.