Disk read bytes/s - Maximum rate at which bytes are transferred from the disk during read operations.
Disk write bytes/s - Maximum rate at which bytes are transferred to the disk during write operations.
Queue monitoring
Leave these fields blank to not perform these tests.
Send queue size (mailbox) - Maximum allowed number of messages in the mailbox send queue.
Receive queue size (mailbox) - Maximum allowed number of messages in the mailbox receive queue.
Send queue size (public) - Maximum allowed number of messages in the public send queue.
Receive queue size (public) - Maximum allowed number of messages in the public receive queue.
SMTP categorizer queue length - Maximum number of allowed messages awaiting processing, such as recipient validation, sorting of local or remote delivery and distribution list recipient expansion. Large number of waiting messages in this queue can indicate performance problems in other Exchange components or Active Directory.
Message queued for delivery - Maximum number of messages queued for delivery.
