| Event type | Generates |
| Add-in | Messages related to the Add-in task. |
| Adminp | Messages related to the Adminp task. |
| Agent | Messages related to agents. |
| Client | Messages related to the client. |
| Comm/Net | Messages related X.PC. |
| Compiler | Messages related to compute and compile functions. |
| Database | Messages related to databases. |
| Directory (LDAP) | Messages related to directory services. |
| Mail | Messages related to mail routing. |
| Misc | Miscellaneous messages not in another event category. |
| Monitor | Messages related to events generated on the Domino Administrator by Server Monitoring. |
| Network | Messages related to the LAN. |
| Replica | Messages related to replication, including event handler notifications generated by a database event generator. |
| Resource | Messages related to system resources. |
| Router | Messages related to mail events. |
| Security | Messages related to ID files and server and database access, including event handler notifications generated by a database event generators. |
| Server | Messages related to conditions on a particular server or server connectivity. These messages can include event handler notifications generated by Domino server event generators. |
| Statistic | Messages related to statistic alarms. |
| Unknown | Messages that have an unknown prefix and are not listed in another event category. |
| Update | Messages related to indexing. |
| Web (HTTP/HTTPS) | Messages related to the HTTP task. |