| Messaging probe name | Description |
| Messaging -- SMTP TCP Port Health | Verifies that SMTP services are successfully processing protocol requests. |
| Messaging -- Message retrieval TCP Port Health | Verifies that the IMAP and POP3 services are successfully processing protocol requests. |
| Messaging -- Route Process State | Monitors the status of the router. |
| Messaging -- SMTP Process State | Monitors the status of the SMTP process. |
| Messaging -- Message retrieval process state | Verifies the health of the IMAP and POP3 tasks that are configured to run on the specified servers. |
| Messaging -- NRPC Routing Status | Using NRPC, the probe sends a message to verify that mail routing is working. |
| Messaging -- Transfer Queue Check | Monitors mail flow to individual destinations. |
| Messaging -- Mail Flow Statistic check | Monitors the amount of mail on a Domino server and checks whether the number of mail messages in the MAIL.BOX file exceeds the number of mail messages that the router can process. |
| Messaging -- Mail Reflector | Tests mail routing to IBM® Lotus® Domino® and non-Domino mail systems. |
| Messaging -- Mail DSN | Uses the Delivery Status Notification (DSN) method to test the mail flow to an SMTP mail system. The destination domain must support the .dsn extension. |